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World War I

World War I
From the top, left to right:
Date28 July 191411 November 1918
(4 years, 3 months and 2 weeks)
Peace treaties
Location
Result Allied Powers victory
See Aftermath of World War I
Territorial
changes
Belligerents
Allied Powers:
 and its territories:
and others ...
Central Powers:
Commanders and leaders
Main Allied leaders: Main Central leaders:
Casualties and losses
  • Military dead:
  • Over 5,525,000
  • Civilian dead:
  • Over 4,000,000
  • Total dead:
  • Over 9,000,000
  • ...further details
  • Military dead:
  • Over 4,386,000
  • Civilian dead:
  • Over 3,700,000
  • Total dead:
  • Over 8,000,000
  • ...further details

World War I (28 July 1914 – 11 November 1918), often abbreviated as WWI, was a global conflict fought between two coalitions, the Allied Powers and the Central Powers. Fighting took place throughout Europe, the Middle East, Africa, the Pacific, and parts of Asia.

The first decade of the 20th century saw increasing diplomatic tension between the European great powers. This reached a breaking point on 28 June 1914, when a Bosnian Serb named Gavrilo Princip assassinated Archduke Franz Ferdinand, heir to the Austro-Hungarian throne. Austria-Hungary held Serbia responsible, and declared war on 28 July. Russia came to Serbia's defence, and by 4 August, Germany, France and Britain were drawn into the war, with the Ottoman Empire joining in November the same year.

German strategy in 1914 was to first defeat France, then transfer forces to the Russian front. However, this failed, and by the end of 1914, the Western Front consisted of a continuous line of trenches stretching from the English Channel to Switzerland. The Eastern Front was more dynamic, but neither side could gain a decisive advantage, despite costly offensives. As the war expanded to more fronts, Bulgaria, Romania, Greece, Italy and others joined in from 1915 onward. In early 1917, the United States entered the war on the side of the Allies, and later the same year, the Bolsheviks seized power in the Russian October Revolution, making peace with the Central Powers in early 1918. Germany launched an offensive in the west in March 1918, but despite initial success, it left the German Army exhausted and demoralised. A successful Allied counter-offensive later that year caused a collapse of the German frontline. By the end of 1918, Bulgaria, the Ottoman Empire and Austria-Hungary agreed to armistices with the Allies, leaving Germany isolated. Facing revolution at home and with his army on the verge of mutiny, Kaiser Wilhelm II abdicated on 9 November. An armistice three days later ended the fighting, and the Paris Peace Conference imposed various settlements on the defeated powers, notably the Treaty of Versailles.

World War I was one of the deadliest wars in history, and resulted in an estimated 9 million soldiers dead and 23 million wounded, while 5 million civilians died due to military action, hunger and disease. Millions more died as a result of genocide, and the devastation of the war heavily contributed to the 1918 Spanish flu pandemic. The dissolution of the Russian, German, Austro-Hungarian, and Ottoman Empires resulted in the creation of new independent states, including Poland, Finland, Czechoslovakia, and Yugoslavia. The inability to manage post-war instability contributed to the outbreak of World War II in September 1939.

Names

The term world war was first coined in September 1914 by German biologist and philosopher Ernst Haeckel. He claimed that "there is no doubt that the course and character of the feared 'European War' ... will become the first world war in the full sense of the word,"[1] in The Indianapolis Star on 20 September 1914.

The term First World War had been used by Lt-Col. Charles à Court Repington, as a title for his memoirs (published in 1920); he had noted his discussion on the matter with a Major Johnstone of Harvard University in his diary entry of 10 September 1918.[2][3]

Prior to World War II, the events of 1914–1918 were generally known as the Great War or simply the World War.[4][5] In August 1914, the magazine The Independent wrote "This is the Great War. It names itself".[6] In October 1914, the Canadian magazine Maclean's similarly wrote, "Some wars name themselves. This is the Great War."[7] Contemporary Europeans also referred to it as "the war to end war" and it was also described as "the war to end all wars" due to their perception of its unparalleled scale, devastation, and loss of life.[8]

Background

Political and military alliances

For much of the 19th century, the major European powers maintained a tenuous balance of power among themselves, known as the Concert of Europe.[9] After 1848, this was challenged by a variety of factors, including Britain's withdrawal into so-called splendid isolation, the decline of the Ottoman Empire, New Imperialism, and the rise of Prussia under Otto von Bismarck. The 1866 Austro-Prussian War established Prussian hegemony in Germany, while victory in the 1870–1871 Franco-Prussian War allowed Bismarck to consolidate the German states into a German Empire under Prussian leadership. Avenging the defeat of 1871, or revanchism, and recovering the provinces of Alsace-Lorraine became the principal objects of French policy for the next forty years.[10]

 
Rival military coalitions in 1914:[k]

In order to isolate France and avoid a war on two fronts, Bismarck negotiated the League of the Three Emperors (German: Dreikaiserbund) between Austria-Hungary, Russia and Germany. After Russian victory in the 1877–1878 Russo-Turkish War, the League was dissolved due to Austrian concerns over Russian influence in the Balkans, an area they considered of vital strategic interest. Germany and Austria-Hungary then formed the 1879 Dual Alliance, which became the Triple Alliance when Italy joined in 1882.[11] For Bismarck, the purpose of these agreements was to isolate France by ensuring the three Empires resolved any disputes between themselves; when this was threatened in 1880 by British and French attempts to negotiate directly with Russia, he reformed the League in 1881, which was renewed in 1883 and 1885. After the agreement lapsed in 1887, he replaced it with the Reinsurance Treaty, a secret agreement between Germany and Russia to remain neutral if either were attacked by France or Austria-Hungary.[12]

Bismarck viewed peace with Russia as the foundation of German foreign policy but after becoming Kaiser in 1890, Wilhelm II forced him to retire and was persuaded not to renew the Reinsurance Treaty by his new Chancellor, Leo von Caprivi.[13] This provided France an opportunity to counteract the Triple Alliance by signing the Franco-Russian Alliance in 1894, followed by the 1904 Entente Cordiale with Britain. The Triple Entente was completed by the 1907 Anglo-Russian Convention. While these were not formal alliances, by settling long-standing colonial disputes in Africa and Asia, the notion of British entry into any future conflict involving France or Russia became a possibility.[14] British and Russian support for France against Germany during the Agadir Crisis in 1911 reinforced their relationship and increased Anglo-German estrangement, deepening the divisions that would erupt in 1914.[15]

Arms race

German industrial strength and production significantly increased after 1871, driven by the creation of a unified Reich, French indemnity payments, and the annexation of Alsace-Lorraine. Backed by Wilhelm II, Admiral Alfred von Tirpitz sought to use this growth in economic power to build a Kaiserliche Marine, or Imperial German Navy, which could compete with the British Royal Navy for world naval supremacy.[16] His thinking was influenced by US naval strategist Alfred Thayer Mahan, who argued possession of a blue-water navy was vital for global power projection; Tirpitz had his books translated into German, while Wilhelm made them required reading for his advisors and senior military personnel.[17]

However, it was also an emotional decision, driven by Wilhelm's simultaneous admiration for the Royal Navy and desire to outdo and surpass it. Bismarck thought that the British would not interfere in Europe, so long as its maritime supremacy remained secure, but his dismissal in 1890 led to a change in policy and an Anglo-German naval arms race began.[18] Despite the vast sums spent by Tirpitz, the launch of HMS Dreadnought in 1906 gave the British a technological advantage over their German rivals which they never lost.[16] Ultimately, the race diverted huge resources into creating a German navy large enough to antagonise Britain, but not defeat it; in 1911, Chancellor Theobald von Bethmann Hollweg acknowledged defeat, leading to the Rüstungswende or 'armaments turning point', when he switched expenditure from the navy to the army.[19]

 
SMS Rheinland, a Nassau-class battleship, Germany's first response to the British Dreadnought

This decision was not driven by a reduction in political tensions, but German concern over Russia's quick recovery from its defeat in the Russo-Japanese War and subsequent 1905 Russian Revolution that same year. Economic reforms backed by funding from the French led to a significant post-1908 expansion of railways and transportation infrastructure, particularly in its western border regions.[20] Since Germany and Austria-Hungary relied on faster mobilisation to compensate for their numerical inferiority compared to Russia, the threat posed by the closing of this gap was more important than competing with the Royal Navy. After Germany expanded its standing army by 170,000 troops in 1913, France extended compulsory military service from two to three years; similar measures were taken by the Balkan powers and Italy, which led to increased expenditure by the Ottomans and Austria-Hungary. Absolute figures are hard to calculate due to differences in categorising expenditure, since they often omit civilian infrastructure projects like railways which also had logistical importance and military use. It is known, however, that from 1908 to 1913, military spending by the six major European powers increased by over 50% in real terms.[21]

Conflicts in the Balkans

 
Sarajevo citizens reading a poster with the proclamation of the Austrian annexation in 1908

The years before 1914 were marked by a series of crises in the Balkans as other powers sought to benefit from Ottoman decline. While Pan-Slavic and Orthodox Russia considered itself the protector of Serbia and other Slav states, they preferred the strategically vital Bosporus straits to be controlled by a weak Ottoman government, rather than an ambitious Slav power like Bulgaria. Since Russia had its own ambitions in northeastern Anatolia and their clients had over-lapping claims in the Balkans, balancing these divided Russian policy-makers and added to regional instability.[22]

Austrian statesmen viewed the Balkans as essential for the continued existence of their Empire, and saw Serbian expansion as a direct threat. The 1908–1909 Bosnian Crisis began when Austria annexed the former Ottoman territory of Bosnia and Herzegovina, which it had occupied since 1878. Timed to coincide with the Bulgarian Declaration of Independence from the Ottoman Empire, this unilateral action was denounced by the European powers, but accepted as there was no consensus on how to resolve the situation. Some historians see this as a significant escalation, ending any chance of Austria co-operating with Russia in the Balkans while also damaging diplomatic relations between Serbia and Italy, both of whom had their own expansionist ambitions in the region.[23]

Tensions increased after the 1911–1912 Italo-Turkish War demonstrated Ottoman weakness and led to the formation of the Balkan League, an alliance of Serbia, Bulgaria, Montenegro, and Greece.[24] The League quickly overran most of the Ottomans' territory in the Balkans during the 1912–1913 First Balkan War, much to the surprise of outside observers.[25] The Serbian capture of ports on the Adriatic resulted in partial Austrian mobilisation starting on 21 November 1912, including units along the Russian border in Galicia. In a meeting the next day, the Russian government decided not to mobilise in response, unwilling to precipitate a war for which they were not as of yet prepared to handle.[26]

The Great Powers sought to re-assert control through the 1913 Treaty of London, which created an independent Albania, while enlarging the territories of Bulgaria, Serbia, Montenegro and Greece. However, disputes between the victors sparked the 33-day Second Balkan War, when Bulgaria attacked Serbia and Greece on 16 June 1913; it was defeated, losing most of Macedonia to Serbia and Greece, and Southern Dobruja to Romania.[27] The result was that even countries which benefited from the Balkan Wars, such as Serbia and Greece, felt cheated of their "rightful gains", while for Austria it demonstrated the apparent indifference with which other powers viewed their concerns, including Germany.[28] This complex mix of resentment, nationalism and insecurity helps explain why the pre-1914 Balkans became known as the "powder keg of Europe".[29]


Prelude

Sarajevo assassination

 
Traditionally thought to show the arrest of Gavrilo Princip (right), this photo is now believed by historians to depict an innocent bystander, Ferdinand Behr[30][31]

On 28 June 1914, Archduke Franz Ferdinand of Austria, heir presumptive to Emperor Franz Joseph, visited Sarajevo, capital of the recently annexed provinces of Bosnia and Herzegovina. Six assassins[l] from the movement known as Young Bosnia, or Mlada Bosna, took up positions along the route taken by the Archduke's motorcade, with the intention of assassinating him. Supplied with arms by extremists within the Serbian Black Hand intelligence organisation, they hoped his death would free Bosnia from Austrian rule, although there was little agreement on what would replace it.[33]

Nedeljko Čabrinović threw a grenade at the Archduke's car and injured two of his aides, who were taken to hospital while the convoy carried on. The other assassins were also unsuccessful but an hour later, as Ferdinand was returning from visiting the injured officers, his car took a wrong turn into a street where Gavrilo Princip was standing. He stepped forward and fired two pistol shots, fatally wounding Ferdinand and his wife Sophie, who both died shortly thereafter.[34] Although Emperor Franz Joseph was shocked by the incident, political and personal differences meant the two men were not close; allegedly, his first reported comment was "A higher power has re-established the order which I, alas, could not preserve".[35]

According to historian Zbyněk Zeman, his reaction was reflected more broadly in Vienna, where "the event almost failed to make any impression whatsoever. On 28 and 29 June, the crowds listened to music and drank wine, as if nothing had happened."[36][37] Nevertheless, the impact of the murder of the heir to the throne was significant, and has been described by historian Christopher Clark as a "9/11 effect, a terrorist event charged with historic meaning, transforming the political chemistry in Vienna".[38]

Expansion of violence in Bosnia and Herzegovina

 
Crowds on the streets in the aftermath of the anti-Serb riots in Sarajevo, 29 June 1914

The Austro-Hungarian authorities encouraged the subsequent anti-Serb riots in Sarajevo, in which Bosnian Croats and Bosniaks killed two Bosnian Serbs and damaged numerous Serb-owned buildings.[39][40] Violent actions against ethnic Serbs were also organised outside Sarajevo, in other cities in Austro-Hungarian-controlled Bosnia and Herzegovina, Croatia and Slovenia. Austro-Hungarian authorities in Bosnia and Herzegovina imprisoned and extradited approximately 5,500 prominent Serbs, 700 to 2,200 of whom died in prison. A further 460 Serbs were sentenced to death. A predominantly Bosniak special militia known as the Schutzkorps was established and carried out the persecution of Serbs.[41][42][43][44]

July Crisis

The assassination initiated the July Crisis, a month of diplomatic manoeuvring between Austria-Hungary, Germany, Russia, France and Britain. Believing Serbian intelligence helped organise Franz Ferdinand's murder, Austrian officials wanted to use the opportunity to end their interference in Bosnia and saw war as the best way of achieving this.[45] However, the Foreign Ministry had no solid proof of Serbian involvement and a dossier used to make its case was riddled with errors.[46] On 23 July, Austria delivered an ultimatum to Serbia, listing ten demands made intentionally unacceptable to provide an excuse for starting hostilities.[47]

 
Ethno-linguistic map of Austria-Hungary, 1910. Bosnia-Herzegovina was annexed in 1908.

Serbia ordered general mobilisation on 25 July, but accepted all the terms, except for those empowering Austrian representatives to suppress "subversive elements" inside Serbia, and take part in the investigation and trial of Serbians linked to the assassination.[48][49] Claiming this amounted to rejection, Austria broke off diplomatic relations and ordered partial mobilisation the next day; on 28 July, they declared war on Serbia and began shelling Belgrade. Having initiated war preparations on 25 July, Russia now ordered general mobilisation in support of Serbia on 30th.[50]

Anxious to ensure backing from the SPD political opposition by presenting Russia as the aggressor, German Chancellor Bethmann Hollweg delayed commencement of war preparations until 31 July.[51] That afternoon the Russian government were handed a note requiring them to "cease all war measures against Germany and Austria-Hungary" within 12 hours.[52] A further German demand for neutrality was refused by the French who ordered general mobilisation but delayed declaring war.[53] The German General Staff had long assumed they faced a war on two fronts; the Schlieffen Plan envisaged using 80% of the army to defeat France in the west, then switch to Russia. Since this required them to move quickly, mobilisation orders were issued that afternoon.[54]

 
Cheering crowds in London and Paris on the day war was declared.

At a meeting on 29 July, the British cabinet had narrowly decided its obligations to Belgium under the 1839 Treaty of London did not require it to oppose a German invasion with military force. However, this was largely driven by Prime Minister Asquith's desire to maintain unity; he and his senior Cabinet ministers were already committed to support France, the Royal Navy had been mobilised and public opinion was strongly in favour of intervention.[55] On 31 July, Britain sent notes to Germany and France, asking them to respect Belgian neutrality; France pledged to do so, Germany did not reply.[56]

Once the German ultimatum to Russia expired on the morning of 1 August, the two countries were at war. Later the same day, Wilhelm was informed by his ambassador in London, Prince Lichnowsky, that Britain would remain neutral if France was not attacked, and might not intervene at all given the ongoing Home Rule Crisis in Ireland.[57] Jubilant at this news, he ordered General Moltke, the German chief of staff, to "march the whole of the ... army to the East". This allegedly brought Moltke to the verge of a nervous breakdown, who protested that "it cannot be done. The deployment of millions cannot be improvised."[58] Lichnowsky soon realised he was mistaken, although Wilhelm insisted on waiting for a telegram from his cousin George V; once received it confirmed there had been a misunderstanding, and he told Moltke, "Now do what you want."[59]

Aware of German plans to attack through Belgium, French Commander-in-Chief Joseph Joffre asked his government for permission to cross the border and pre-empt such a move. To avoid a violation of Belgian neutrality, he was told any advance could come only after a German invasion.[60] On 2 August, Germany occupied Luxembourg and exchanged fire with French units; on 3 August, they declared war on France and demanded free passage across Belgium, which was refused. Early on the morning of 4 August, the Germans invaded and Albert I of Belgium called for assistance under the Treaty of London.[61][62] Britain sent Germany an ultimatum demanding they withdraw from Belgium; when this expired at midnight without a response, the two empires were at war.[63]

Progress of the war

Opening hostilities

Confusion among the Central Powers

The strategy of the Central Powers suffered from miscommunication. Germany had promised to support Austria-Hungary's invasion of Serbia, but interpretations of what this meant differed. Previously tested deployment plans had been replaced early in 1914, but those had never been tested in exercises. Austro-Hungarian leaders believed Germany would cover its northern flank against Russia.[64] Germany, however, envisioned Austria-Hungary directing most of its troops against Russia, while Germany dealt with France. This confusion forced the Austro-Hungarian Army to divide its forces between the Russian and Serbian fronts.[citation needed]

Serbian campaign

 
Serbian Army Blériot XI "Oluj", 1915

Beginning on 12 August, the Austrian and Serbs clashed at the battles of the Cer and Kolubara; over the next two weeks, Austrian attacks were repulsed with heavy losses, dashing their hopes of a swift victory and marking the first major Allied victories of the war. As a result, Austria had to keep sizeable forces on the Serbian front, weakening its efforts against Russia.[65] Serbia's defeat of the 1914 invasion has been called one of the major upset victories of the twentieth century.[66] In spring 1915, the campaign saw the first use of anti-aircraft warfare after an Austrian plane was shot down with ground-to-air fire, as well as the first medical evacuation by the Serbian army in autumn 1915.[67][68]

German offensive in Belgium and France

 
German soldiers on the way to the front in 1914; at this stage, all sides expected the conflict to be a short one.

Upon mobilisation in 1914, 80% of the German Army was located on the Western Front, with the remainder acting as a screening force in the East; officially titled Aufmarsch II West, it is better known as the Schlieffen Plan after its creator, Alfred von Schlieffen, head of the German General Staff from 1891 to 1906. Rather than a direct attack across their shared frontier, the German right wing would sweep through the Netherlands and Belgium, then swing south, encircling Paris and trapping the French army against the Swiss border. Schlieffen estimated this would take six weeks, after which the German army would transfer to the East and defeat the Russians.[69]

The plan was substantially modified by his successor, Helmuth von Moltke the Younger. Under Schlieffen, 85% of German forces in the west were assigned to the right wing, with the remainder holding along the frontier. By keeping his left wing deliberately weak, he hoped to lure the French into an offensive into the "lost provinces" of Alsace-Lorraine, which was in fact the strategy envisaged by their Plan XVII.[69] However, Moltke grew concerned the French might push too hard on his left flank and as the German Army increased in size from 1908 to 1914, he changed the allocation of forces between the two wings from 85:15 to 70:30.[70] He also considered Dutch neutrality essential for German trade and cancelled the incursion into the Netherlands, which meant any delays in Belgium threatened the entire viability of the plan.[71] Historian Richard Holmes argues these changes meant the right wing was not strong enough to achieve decisive success and thus led to unrealistic goals and timings.[72]

 
French bayonet charge during the Battle of the Frontiers; by the end of August, French casualties exceeded 260,000, including 75,000 dead.

The initial German advance in the West was very successful and by the end of August the Allied left, which included the British Expeditionary Force (BEF), was in full retreat. At the same time, the French offensive in Alsace-Lorraine was a disastrous failure, with casualties exceeding 260,000, including 27,000 killed on 22 August during the Battle of the Frontiers.[73] German planning provided broad strategic instructions, while allowing army commanders considerable freedom in carrying them out at the front; this worked well in 1866 and 1870 but in 1914, von Kluck used this freedom to disobey orders, opening a gap between the German armies as they closed on Paris.[74] The French and British exploited this gap to halt the German advance east of Paris at the First Battle of the Marne from 5 to 12 September and push the German forces back some 50 km (31 mi).[citation needed]

In 1911, the Russian Stavka had agreed with the French to attack Germany within fifteen days of mobilisation, ten days before the Germans had anticipated, although it meant the two Russian armies that entered East Prussia on 17 August did so without many of their support elements.[75]

By the end of 1914, German troops held strong defensive positions inside France, controlled the bulk of France's domestic coalfields and had inflicted 230,000 more casualties than it lost itself. However, communications problems and questionable command decisions cost Germany the chance of a decisive outcome, while it had failed to achieve the primary objective of avoiding a long, two-front war.[76] As was apparent to a number of German leaders, this amounted to a strategic defeat; shortly after the Marne, Crown Prince Wilhelm told an American reporter; "We have lost the war. It will go on for a long time but lost it is already."[77]

Asia and the Pacific

 
World empires and colonies around 1914

On 30 August 1914, New Zealand occupied German Samoa, now the independent state of Samoa. On 11 September, the Australian Naval and Military Expeditionary Force landed on the island of New Britain, then part of German New Guinea. On 28 October, the German cruiser SMS Emden sank the Russian cruiser Zhemchug in the Battle of Penang. Japan declared war on Germany prior to seizing territories in the Pacific which later became the South Seas Mandate, as well as German Treaty ports on the Chinese Shandong peninsula at Tsingtao. After Vienna refused to withdraw its cruiser SMS Kaiserin Elisabeth from Tsingtao, Japan declared war on Austria-Hungary as well, and the ship was sunk at Tsingtao in November 1914.[78] Within a few months, Allied forces had seized all German territories in the Pacific, leaving only isolated commerce raiders and a few holdouts in New Guinea.[79][80]

African campaigns

Some of the first clashes of the war involved British, French, and German colonial forces in Africa. On 6–7 August, French and British troops invaded the German protectorate of Togoland and Kamerun. On 10 August, German forces in South-West Africa attacked South Africa; sporadic and fierce fighting continued for the rest of the war. The German colonial forces in German East Africa, led by Colonel Paul von Lettow-Vorbeck, fought a guerrilla warfare campaign during World War I and only surrendered two weeks after the armistice took effect in Europe.[81]

Indian support for the Allies

 
British Indian Army infantry divisions in France; these troops were withdrawn in December 1915, and served in the Mesopotamian campaign.

Prior to the war, Germany had attempted to use Indian nationalism and pan-Islamism to its advantage, a policy continued post-1914 by instigating uprisings in India, while the Niedermayer–Hentig Expedition urged Afghanistan to join the war on the side of Central Powers. However, contrary to British fears of a revolt in India, the outbreak of the war saw a reduction in nationalist activity.[82][83] This was largely because leaders from the Indian National Congress and other groups believed support for the British war effort would hasten Indian Home Rule, a promise allegedly made explicit in 1917 by Edwin Montagu, then Secretary of State for India.[84]

In 1914, the British Indian Army was larger than the British Army itself, and between 1914 and 1918 an estimated 1.3 million Indian soldiers and labourers served in Europe, Africa, and the Middle East, while the Government of India and their princely allies supplied large quantities of food, money, and ammunition. In all, 140,000 soldiers served on the Western Front and nearly 700,000 in the Middle East, with 47,746 killed and 65,126 wounded.[85]

The suffering engendered by the war, as well as the failure of the British government to grant self-government to India after the end of hostilities, bred disillusionment and resulted in the campaign for full independence led by Mahatma Gandhi.[86]

Western Front 1914 to 1916

Trench warfare begins

 
British Indian soldiers digging trenches in Laventie, France, 1915

Pre-war military tactics that emphasised open warfare and the individual rifleman proved obsolete when confronted with conditions prevailing in 1914. Technological advances allowed the creation of strong defensive systems largely impervious to massed infantry advances, such as barbed wire, machine guns and above all far more powerful artillery, which dominated the battlefield and made crossing open ground extremely difficult.[87] Both sides struggled to develop tactics for breaching entrenched positions without suffering heavy casualties. In time, however, technology enabled the production of new offensive weapons, such as gas warfare and the tank.[88]

After the First Battle of the Marne in September 1914, Allied and German forces unsuccessfully tried to outflank each other, a series of manoeuvres later known as the "Race to the Sea". By the end of 1914, the opposing forces confronted each other along an uninterrupted line of entrenched positions from the Channel to the Swiss border.[89] Since the Germans were normally able to choose where to stand, they generally held the high ground, while their trenches tended to be better built; those constructed by the French and English were initially considered "temporary", only needed until an offensive would smash the German defences.[90] Both sides tried to break the stalemate using scientific and technological advances. On 22 April 1915, at the Second Battle of Ypres, the Germans (violating the Hague Convention) used chlorine gas for the first time on the Western Front. Several types of gas soon became widely used by both sides, and though it never proved a decisive, battle-winning weapon, it became one of the most-feared and best-remembered horrors of the war.[91][92]

Continuation of trench warfare

Neither side proved able to deliver a decisive blow for the next two years. Throughout 1915–17, the British Empire and France suffered more casualties than Germany, because of both the strategic and tactical stances chosen by the sides. Strategically, while the Germans mounted only one major offensive, the Allies made several attempts to break through the German lines.[citation needed]

 
German casualties at the Somme, 1916

In February 1916 the Germans attacked French defensive positions at the Battle of Verdun, lasting until December 1916. The Germans made initial gains, before French counter-attacks returned matters to near their starting point. Casualties were greater for the French, but the Germans bled heavily as well, with anywhere from 700,000[93] to 975,000[94] casualties suffered between the two combatants. Verdun became a symbol of French determination and self-sacrifice.[95]

The Battle of the Somme was an Anglo-French offensive of July to November 1916. The opening day on 1 July 1916 was the bloodiest single day in the history of the British Army, which suffered 57,470 casualties, including 19,240 dead. As a whole, the Somme offensive led to an estimated 420,000 British casualties, along with 200,000 French and 500,000 German.[96] Gun fire was not the only factor taking lives; the diseases that emerged in the trenches were a major killer on both sides. The living conditions made it so that countless diseases and infections occurred, such as trench foot, shell shock, blindness/burns from mustard gas, lice, trench fever, "cooties" (body lice) and the 'Spanish flu'.[97][unreliable source?]

Naval war

 
Battleships of the Hochseeflotte, 1917

At the start of the war, German cruisers were scattered across the globe, some of which were subsequently used to attack Allied merchant shipping. The British Royal Navy systematically hunted them down, though not without some embarrassment from its inability to protect Allied shipping. For example, the light cruiser SMS Emden, which was part of the German East Asia Squadron stationed at Qingdao, seized or sank 15 merchantmen, as well as a Russian cruiser and a French destroyer. Most of the squadron was returning to Germany when it sank two British armoured cruisers at the Battle of Coronel in November 1914, before being virtually destroyed at the Battle of the Falkland Islands in December. The SMS Dresden escaped with a few auxiliaries, but after the Battle of Más a Tierra, these too had either been destroyed or interned.[98]

Soon after the outbreak of hostilities, Britain began a naval blockade of Germany. The strategy proved effective, cutting off vital military and civilian supplies, although this blockade violated accepted international law codified by several international agreements of the past two centuries.[99] Britain mined international waters to prevent any ships from entering entire sections of ocean, causing danger to even neutral ships.[100] Since there was limited response to this tactic of the British, Germany expected a similar response to its unrestricted submarine warfare.[101]

The Battle of Jutland (German: Skagerrakschlacht, or "Battle of the Skagerrak") in May/June 1916 developed into the largest naval battle of the war. It was the only full-scale clash of battleships during the war, and one of the largest in history. The Kaiserliche Marine's High Seas Fleet, commanded by Vice Admiral Reinhard Scheer, fought the Royal Navy's Grand Fleet, led by Admiral Sir John Jellicoe. The engagement was a stand off, as the Germans were outmanoeuvred by the larger British fleet, but managed to escape and inflicted more damage to the British fleet than they received. Strategically, however, the British asserted their control of the sea, and the bulk of the German surface fleet remained confined to port for the duration of the war.[102]

 
U-155 exhibited near Tower Bridge in London, after the 1918 Armistice

German U-boats attempted to cut the supply lines between North America and Britain.[103] The nature of submarine warfare meant that attacks often came without warning, giving the crews of the merchant ships little hope of survival.[103][104] The United States launched a protest, and Germany changed its rules of engagement. After the sinking of the passenger ship RMS Lusitania in 1915, Germany promised not to target passenger liners, while Britain armed its merchant ships, placing them beyond the protection of the "cruiser rules", which demanded warning and movement of crews to "a place of safety" (a standard that lifeboats did not meet).[105] Finally, in early 1917, Germany adopted a policy of unrestricted submarine warfare, realising the Americans would eventually enter the war.[103][106] Germany sought to strangle Allied sea lanes before the United States could transport a large army overseas, but after initial successes eventually failed to do so.[103]

The U-boat threat lessened in 1917, when merchant ships began travelling in convoys, escorted by destroyers. This tactic made it difficult for U-boats to find targets, which significantly lessened losses; after the hydrophone and depth charges were introduced, accompanying destroyers could attack a submerged submarine with some hope of success. Convoys slowed the flow of supplies since ships had to wait as convoys were assembled. The solution to the delays was an extensive program of building new freighters. Troopships were too fast for the submarines and did not travel the North Atlantic in convoys.[107] The U-boats had sunk more than 5,000 Allied ships, at a cost of 199 submarines.[108]

World War I also saw the first use of aircraft carriers in combat, with HMS Furious launching Sopwith Camels in a successful raid against the Zeppelin hangars at Tondern in July 1918, as well as blimps for antisubmarine patrol.[109]

Southern theatres

War in the Balkans

 
Refugee transport from Serbia in Leibnitz, Styria, 1914
 
Bulgarian soldiers in a trench, preparing to fire against an incoming aeroplane
 
Austro-Hungarian troops executing captured Serbians, 1917. Serbia lost about 850,000 people during the war, a quarter of its pre-war population.[110]

Faced with Russia in the east, Austria-Hungary could spare only one-third of its army to attack Serbia. After suffering heavy losses, the Austrians briefly occupied the Serbian capital, Belgrade. A Serbian counter-attack in the Battle of Kolubara succeeded in driving them from the country by the end of 1914. For the first ten months of 1915, Austria-Hungary used most of its military reserves to fight Italy. German and Austro-Hungarian diplomats, however, scored a coup by persuading Bulgaria to join the attack on Serbia.[111] The Austro-Hungarian provinces of Slovenia, Croatia and Bosnia provided troops for Austria-Hungary in the fight with Serbia, Russia and Italy. Montenegro allied itself with Serbia.[112]

Bulgaria declared war on Serbia on 14 October 1915 and joined in the attack by the Austro-Hungarian army under Mackensen's army of 250,000 that was already underway. Serbia was conquered in a little more than a month, as the Central Powers, now including Bulgaria, sent in 600,000 troops total. The Serbian army, fighting on two fronts and facing certain defeat, retreated into northern Albania. The Serbs suffered defeat in the Battle of Kosovo. Montenegro covered the Serbian retreat towards the Adriatic coast in the Battle of Mojkovac in 6–7 January 1916, but ultimately the Austrians also conquered Montenegro. The surviving Serbian soldiers were evacuated by ship to Greece.[113] After conquest, Serbia was divided between Austro-Hungary and Bulgaria.[114]

In late 1915, a Franco-British force landed at Salonica in Greece to offer assistance and to pressure its government to declare war against the Central Powers. However, the pro-German King Constantine I dismissed the pro-Allied government of Eleftherios Venizelos before the Allied expeditionary force arrived.[115] The friction between the King of Greece and the Allies continued to accumulate with the National Schism, which effectively divided Greece between regions still loyal to the king and the new provisional government of Venizelos in Salonica. After intense negotiations and an armed confrontation in Athens between Allied and royalist forces (an incident known as Noemvriana), the King of Greece abdicated and his second son Alexander took his place; Greece officially joined the war on the side of the Allies in June 1917.[citation needed]

The Macedonian front was initially mostly static. French and Serbian forces retook limited areas of Macedonia by recapturing Bitola on 19 November 1916 following the costly Monastir offensive, which brought stabilisation of the front.[116]

Serbian and French troops finally made a breakthrough in September 1918 in the Vardar offensive, after most of the German and Austro-Hungarian troops had been withdrawn. The Bulgarians were defeated at the Battle of Dobro Pole, and by 25 September British and French troops had crossed the border into Bulgaria proper as the Bulgarian army collapsed. Bulgaria capitulated four days later, on 29 September 1918.[117] The German high command responded by despatching troops to hold the line, but these forces were far too weak to re-establish a front.[118]

The disappearance of the Macedonian front meant that the road to Budapest and Vienna was now opened to Allied forces. Hindenburg and Ludendorff concluded that the strategic and operational balance had now shifted decidedly against the Central Powers and, a day after the Bulgarian collapse, insisted on an immediate peace settlement.[119]

Ottoman Empire

 
Australian troops charging near a Turkish trench during the Gallipoli Campaign
 
Mehmed V greeting Wilhelm II on his arrival at Constantinople

The Ottomans threatened Russia's Caucasian territories and Britain's communications with India via the Suez Canal. As the conflict progressed, the Ottoman Empire took advantage of the European powers' preoccupation with the war and conducted large-scale ethnic cleansing of the indigenous Armenian, Greek, and Assyrian Christian populations, known as the Armenian genocide, Greek genocide, and Sayfo respectively.[120][121][122]

The British and French opened overseas fronts with the Gallipoli (1915) and Mesopotamian campaigns (1914). In Gallipoli, the Ottoman Empire successfully repelled the British, French, and Australian and New Zealand Army Corps (ANZACs). In Mesopotamia, by contrast, after the defeat of the British defenders in the siege of Kut by the Ottomans (1915–16), British Imperial forces reorganised and captured Baghdad in March 1917. The British were aided in Mesopotamia by local Arab and Assyrian fighters, while the Ottomans employed local Kurdish and Turcoman tribes.[123]

 
Italian Bersaglieri with a machine-gun instructor in Palestine

Further to the west, the Suez Canal was defended from Ottoman attacks in 1915 and 1916; in August, a German and Ottoman force was defeated at the Battle of Romani by the ANZAC Mounted Division and the 52nd (Lowland) Infantry Division. Following this victory, an Egyptian Expeditionary Force advanced across the Sinai Peninsula, pushing Ottoman forces back in the Battle of Magdhaba in December and the Battle of Rafa on the border between the Egyptian Sinai and Ottoman Palestine in January 1917.[124]

Russian armies generally had success in the Caucasus campaign. Enver Pasha, supreme commander of the Ottoman armed forces, was ambitious and dreamed of re-conquering central Asia and areas that had been lost to Russia previously. He was, however, a poor commander.[125] He launched an offensive against the Russians in the Caucasus in December 1914 with 100,000 troops, insisting on a frontal attack against mountainous Russian positions in winter. He lost 86% of his force at the Battle of Sarikamish.[126]

 
Kaiser Wilhelm II inspecting Turkish troops of the 15th Corps in East Galicia, Austria-Hungary (now Poland). Prince Leopold of Bavaria, the Supreme Commander of the German Army on the Eastern Front, is second from the left.

The Ottoman Empire, with German support, invaded Persia (modern Iran) in December 1914 in an effort to cut off British and Russian access to petroleum reservoirs around Baku near the Caspian Sea.[127] Persia, ostensibly neutral, had long been under the spheres of British and Russian influence. The Ottomans and Germans were aided by Kurdish and Azeri forces, together with a large number of major Iranian tribes, such as the Qashqai, Tangistanis, Lurs, and Khamseh, while the Russians and British had the support of Armenian and Assyrian forces. The Persian campaign was to last until 1918 and end in failure for the Ottomans and their allies. However, the Russian withdrawal from the war in 1917 led to Armenian and Assyrian forces, who had hitherto inflicted a series of defeats upon the forces of the Ottomans and their allies, being cut off from supply lines, outnumbered, outgunned and isolated, forcing them to fight and flee towards British lines in northern Mesopotamia.[128]

 
Russian forest trench at the Battle of Sarikamish, 1914–1915

General Yudenich, the Russian commander from 1915 to 1916, drove the Turks out of most of the southern Caucasus with a string of victories.[126] During the 1916 campaign, the Russians defeated the Turks in the Erzurum offensive, also occupying Trabzon. In 1917, Russian Grand Duke Nicholas assumed command of the Caucasus front. Nicholas planned a railway from Russian Georgia to the conquered territories so that fresh supplies could be brought up for a new offensive in 1917. However, in March 1917 (February in the pre-revolutionary Russian calendar), the Tsar abdicated in the course of the February Revolution, and the Russian Caucasus Army began to fall apart.[citation needed]

The Arab Revolt, instigated by the Arab bureau of the British Foreign Office, started June 1916 with the Battle of Mecca, led by Sharif Hussein of Mecca, and ended with the Ottoman surrender of Damascus. Fakhri Pasha, the Ottoman commander of Medina, resisted for more than two and half years during the siege of Medina before surrendering in January 1919.[129]

The Senussi tribe, along the border of Italian Libya and British Egypt, incited and armed by the Turks, waged a small-scale guerrilla war against Allied troops. The British were forced to dispatch 12,000 troops to oppose them in the Senussi campaign. Their rebellion was finally crushed in mid-1916.[130]

Total Allied casualties on the Ottoman fronts amounted 650,000 men. Total Ottoman casualties were 725,000, with 325,000 dead and 400,000 wounded.[131]

Italian Front

 
Isonzo Offensives 1915–1917

Although Italy joined the Triple Alliance in 1882, a treaty with its traditional Austrian enemy was so controversial that subsequent governments denied its existence and the terms were only made public in 1915.[132] This arose from nationalist designs on Austro-Hungarian territory in Trentino, the Austrian Littoral, Rijeka and Dalmatia, which were considered vital to secure the borders established in 1866.[133] In 1902, Rome secretly agreed with France to remain neutral if the latter was attacked by Germany, effectively nullifying its role in the Triple Alliance.[134]

 
Italian soldiers in trench, 1918
 
Austro-Hungarian trench at 3,850 metres in the Ortler Alps, one of the most challenging fronts of the war

When the war began in 1914, Italy argued the Triple Alliance was defensive in nature and it was not obliged to support an Austrian attack on Serbia. Opposition to joining the Central Powers increased when Turkey became a member in September, since in 1911 Italy had occupied Ottoman possessions in Libya and the Dodecanese islands.[135] To secure Italian neutrality, the Central Powers offered them the French protectorate of Tunisia, while in return for an immediate entry into the war, the Allies agreed to their demands for Austrian territory and sovereignty over the Dodecanese.[136] Although they remained secret, these provisions were incorporated into the April 1915 Treaty of London; Italy joined the Triple Entente and on 23 May declared war on Austria-Hungary,[137] followed by Germany fifteen months later.

The pre-1914 Italian army was the weakest in Europe, short of officers, trained men, adequate transport and modern weapons; by April 1915, some of these deficiencies had been remedied but it was still unprepared for the major offensive required by the Treaty of London.[138] The advantage of superior numbers was offset by the difficult terrain; much of the fighting took place at altitudes of over 3000 metres in the Alps and Dolomites, where trench lines had to be cut through rock and ice and keeping troops supplied was a major challenge. These issues were exacerbated by unimaginative strategies and tactics.[139] Between 1915 and 1917, the Italian commander, Luigi Cadorna, undertook a series of frontal assaults along the Isonzo which made little progress and cost many lives; by the end of the war, total Italian combat deaths totalled around 548,000.[140]

In the spring of 1916, the Austro-Hungarians counterattacked in Asiago in the Strafexpedition, but made little progress and were pushed by the Italians back to the Tyrol.[141] Although an Italian corps occupied southern Albania in May 1916, their main focus was the Isonzo front which after the capture of Gorizia in August 1916 remained static until October 1917. After a combined Austro-German force won a major victory at Caporetto, Cadorna was replaced by Armando Diaz who retreated more than 100 kilometres (62 mi) before holding positions along the Piave River.[142] A second Austrian offensive was repulsed in June 1918 and by October it was clear the Central Powers had lost the war. On 24 October, Diaz launched the Battle of Vittorio Veneto and initially met stubborn resistance, [143] but with Austria-Hungary collapsing, Hungarian divisions in Italy now demanded they be sent home.[144] When this was granted, many others followed and the Imperial army disintegrated, the Italians taking over 300,000 prisoners.[145] On 3 November, the Armistice of Villa Giusti ended hostilities between Austria-Hungary and Italy which occupied Trieste and areas along the Adriatic Sea awarded to it in 1915.[146]

Romanian participation

 
 
Bucharest
 
Timișoara (Banat)
 
Cluj (Transylvania)
 
Chișinău (Moldova)
 
Constanța (Dobruja)
 
Bulgaria
 
Hungary
 
Mărășești
 
Oituz
class=notpageimage|
Romania key locations 1916–1918 (note; using 2022 borders)

Despite secretly agreeing to support the Triple Alliance in 1883, Romania increasingly found itself at odds with the Central Powers over their support for Bulgaria in the 1912 to 1913 Balkan Wars and the status of ethnic Romanian communities in Hungarian-controlled Transylvania,[147] which comprised an estimated 2.8 million of the 5.0 million population.[148] With the ruling elite split into pro-German and pro-Entente factions, Romania remained neutral in 1914, arguing like Italy that because Austria-Hungary had declared war on Serbia, it was under no obligation to join them.[149] They maintained this position for the next two years, while allowing Germany and Austria to transport military supplies and advisors across Romanian territory.[150]

In September 1914, Russia had acknowledged Romanian rights to Austro-Hungarian territories including Transylvania and Banat, whose acquisition had widespread popular support, [148] and Russian success against Austria led Romania to join the Entente in the August 1916 Treaty of Bucharest.[150] Under the strategic plan known as Hypothesis Z, the Romanian army planned an offensive into Transylvania, while defending Southern Dobruja and Giurgiu against a possible Bulgarian counterattack.[151] On 27 August 1916, they attacked Transylvania and occupied substantial parts of the province before being driven back by the recently formed German 9th Army, led by former Chief of Staff Falkenhayn.[152] A combined German-Bulgarian-Turkish offensive captured Dobruja and Giurgiu, although the bulk of the Romanian army managed to escape encirclement and retreated to Bucharest, which surrendered to the Central Powers on 6 December 1916.[153]

 
Romanian troops during the Battle of Mărășești, 1917

On 7 May 1918 Romania signed the Treaty of Bucharest with the Central Powers, which recognised Romanian sovereignty over Bessarabia in return for ceding control of passes in the Carpathian Mountains to Austria-Hungary and granting oil concessions to Germany.[154] Although approved by Parliament, Ferdinand I refused to sign the treaty, hoping for an Allied victory; Romania re-entered the war on 10 November 1918 on the side of the Allies and the Treaty of Bucharest was formally annulled by the Armistice of 11 November 1918.[155][m] Between 1914 and 1918, an estimated 400,000 to 600,000 ethnic Romanians served with the Austro-Hungarian army, of whom up to 150,000 were killed in action; total military and civilian deaths within contemporary Romanian borders are estimated at 748,000.[157]

Eastern Front

Initial actions

 
Emperor Nicholas II and Grand Duke Nikolaevich following the Russian capture of Przemyśl, the longest siege of the war.

As previously agreed with France, Russian plans at the start of the war were to simultaneously advance into Austrian Galicia and East Prussia as soon as possible. Although their attack on Galicia was largely successful, and the invasions achieved their aim of forcing Germany to divert troops from the Western Front, the speed of mobilisation meant they did so without much of their heavy equipment and support functions. These weaknesses contributed to Russian defeats at Tannenberg and the Masurian Lakes in August and September 1914, forcing them to withdraw from East Prussia with heavy losses.[158][159] By spring 1915, they had also retreated from Galicia, and the May 1915 Gorlice–Tarnów offensive then allowed the Central Powers to invade Russian-occupied Poland.[160] On 5 August, the loss of Warsaw forced the Russians to abandon their Polish territories.[citation needed]

Despite the successful June 1916 Brusilov offensive against the Austrians in eastern Galicia,[161] shortages of supplies, heavy losses and command failures prevented the Russians from fully exploiting their victory. However, it was one of the most significant and impactful offensives of the war, diverting German resources from Verdun, relieving Austro-Hungarian pressure on the Italians, and convincing Romania to enter the war on the side of the Allies on 27 August. It also fatally weakened both the Austrian and Russian armies, whose offensive capabilities were badly affected by their losses and increased the disillusionment with the war that ultimately led to the Russian revolutions.[162]

Meanwhile, unrest grew in Russia as the Tsar remained at the front, with the home front controlled by Empress Alexandra. Her increasingly incompetent rule and food shortages in urban areas led to widespread protests and the murder of her favourite, Grigori Rasputin, at the end of 1916.[163]

Central Powers peace overtures

 
"They shall not pass", a phrase typically associated with the defence of Verdun

On 12 December 1916, after ten brutal months of the Battle of Verdun and a successful offensive against Romania, Germany attempted to negotiate a peace with the Allies.[164] However, this attempt was rejected out of hand as a "duplicitous war ruse".[164]

Soon after, US president Woodrow Wilson attempted to intervene as a peacemaker, asking in a note for both sides to state their demands and start negotiations. Lloyd George's War Cabinet considered the German offer to be a ploy to create divisions amongst the Allies. After initial outrage and much deliberation, they took Wilson's note as a separate effort, signalling that the United States was on the verge of entering the war against Germany following the "submarine outrages". While the Allies debated a response to Wilson's offer, the Germans chose to rebuff it in favour of "a direct exchange of views". Learning of the German response, the Allied governments were free to make clear demands in their response of 14 January. They sought restoration of damages, the evacuation of occupied territories, reparations for France, Russia and Romania, and a recognition of the principle of nationalities.[165] This included the liberation of Italians, Slavs, Romanians, Czecho-Slovaks, and the creation of a "free and united Poland".[165] On the question of security, the Allies sought guarantees that would prevent or limit future wars, complete with sanctions, as a condition of any peace settlement.[166] The negotiations failed and the Entente powers rejected the German offer on the grounds that Germany had not put forward any specific proposals.[citation needed]

Final years of the war

Russian Revolution and withdrawal

By the end of 1916, Russian casualties totalled nearly five million killed, wounded or captured, with major urban areas affected by food shortages and high prices. In March 1917, Tsar Nicholas ordered the military to forcibly suppress a wave of strikes in Petrograd but the troops refused to fire on the crowds.[167] Revolutionaries set up the Petrograd Soviet and fearing a left-wing takeover, the State Duma forced Nicholas to abdicate and established the Russian Provisional Government, which confirmed Russia's willingness to continue the war. However, the Petrograd Soviet refused to disband, creating competing power centres and caused confusion and chaos, with frontline soldiers becoming increasingly demoralised and unwilling to fight on.[168]

Following the Tsar's abdication, Vladimir Lenin—with the help of the German government—was ushered by train from Switzerland into Russia on 16 April 1917. Discontent and the weaknesses of the Provisional Government led to a rise in the popularity of the Bolshevik Party, led by Lenin, which demanded an immediate end to the war. The Revolution of November was followed in December by an armistice and negotiations with Germany. At first, the Bolsheviks refused the German terms, but when German troops began marching across Ukraine unopposed, the new government acceded to the Treaty of Brest-Litovsk on 3 March 1918. The treaty ceded vast territories, including Finland, Estonia, Latvia, Lithuania, parts of Poland and Ukraine to the Central Powers.[169]

With the Russian Empire out of the war, Romania found itself alone on the Eastern Front and signed the Treaty of Bucharest with the Central Powers in May 1918, ending the state of war between Romania and the Central Powers. Under the terms of the treaty, Romania had to give territory to Austria-Hungary and Bulgaria, and lease its oil reserves to Germany. However, the terms also included the Central Powers recognition of the union of Bessarabia with Romania.[170][171]

United States enters the war

 
President Wilson asking Congress to declare war on Germany, 2 April 1917

The United States was a major supplier of war materiel to the Allies but remained neutral in 1914, in large part due to domestic opposition.[172] The most significant factor in creating the support Wilson needed was the German submarine offensive, which not only cost American lives, but paralysed trade as ships were reluctant to put to sea.[173]

On 6 April 1917, Congress declared war on Germany as an "Associated Power" of the Allies.[174] The United States Navy sent a battleship group to Scapa Flow to join the Grand Fleet and provided convoy escorts. In April 1917, the United States Army had fewer than 300,000 men, including National Guard units, compared to British and French armies of 4.1 and 8.3 million respectively. The Selective Service Act of 1917 drafted 2.8 million men, although training and equipping such numbers was a huge logistical challenge. By June 1918, over 667,000 members of the American Expeditionary Forces (AEF), had been transported to France, a figure which reached 2 million by the end of November.[175]

Despite his conviction Germany must be defeated, Wilson went to war to ensure the US played a leading role in shaping the peace, which meant preserving the AEF as a separate military force, rather than being absorbed into British or French units as his Allies wanted.[176] He was strongly supported by AEF commander General John J. Pershing, a proponent of pre-1914 "open warfare" who considered the French and British emphasis on artillery as misguided and incompatible with American "offensive spirit".[177] Much to the frustration of his Allies, who had suffered heavy losses in 1917, he insisted on retaining control of American troops and refused to commit them to the front line until able to operate as independent units. As a result, the first significant US involvement was the Meuse–Argonne offensive in late September 1918.[178]

Nivelle Offensive (April–May 1917)

 
French infantry advance on the Chemin des Dames, April 1917

In December 1916, Robert Nivelle replaced Pétain as commander of French armies on the Western Front and began planning a spring attack in Champagne, part of a joint Franco-British operation. Nivelle claimed the capture of his main objective, the Chemin des Dames, would achieve a massive breakthrough and cost no more than 15,000 casualties.[179] Poor security meant German intelligence was well informed on tactics and timetables, but despite this, when the attack began on 16 April the French made substantial gains, before being brought to a halt by the newly built and extremely strong defences of the Hindenburg Line. Nivelle persisted with frontal assaults and by 25 April the French had suffered nearly 135,000 casualties, including 30,000 dead, most incurred in the first two days.[180]

 
Canadian Corps troops at the Battle of Vimy Ridge, 1917

Concurrent British attacks at Arras were more successful, although ultimately of little strategic value.[181] Operating as a separate unit for the first time, the Canadian Corps capture of Vimy Ridge during the battle is viewed by many Canadians as a defining moment in creating a sense of national identity.[182][183] Although Nivelle continued the offensive, on 3 May the 21st Division, which had been involved in some of the heaviest fighting at Verdun, refused orders to go into battle, initiating the French Army mutinies; within days, acts of "collective indiscipline" had spread to 54 divisions, while over 20,000 deserted.[184] Unrest was almost entirely confined to the infantry, whose demands were largely non-political, including better economic support for families at home, and regular periods of leave, which Nivelle had ended.[185]

Sinai and Palestine campaign (1917–1918)

 
British artillery battery on Mount Scopus in the Battle of Jerusalem, 1917. Foreground, a battery of 16 heavy guns. Background, conical tents and support vehicles.

In March and April 1917, at the First and Second Battles of Gaza, German and Ottoman forces stopped the advance of the Egyptian Expeditionary Force, which had begun in August 1916 at the Battle of Romani.[186][187] At the end of October, the Sinai and Palestine campaign resumed, when General Edmund Allenby's XXth Corps, XXI Corps and Desert Mounted Corps won the Battle of Beersheba.[188] Two Ottoman armies were defeated a few weeks later at the Battle of Mughar Ridge and, early in December, Jerusalem was captured following another Ottoman defeat at the Battle of Jerusalem.[189][190][191] About this time, Friedrich Freiherr Kress von Kressenstein was relieved of his duties as the Eighth Army's commander, replaced by Djevad Pasha, and a few months later the commander of the Ottoman Army in Palestine, Erich von Falkenhayn, was replaced by Otto Liman von Sanders.[192][193]

In early 1918, the front line was extended and the Jordan Valley was occupied, following the First Transjordan and the Second Transjordan attacks by British Empire forces in March and April 1918.[194]

German spring offensive (March–July 1918)

In December 1917, the Central Powers signed an armistice with Russia, thus freeing large numbers of German troops for use in the west. With German reinforcements and new American troops pouring in, the outcome was to be decided on the Western Front. The Central Powers knew that they could not win a protracted war, but they held high hopes for success based on a final quick offensive. Furthermore, both sides became increasingly fearful of social unrest and revolution in Europe. Thus, both sides urgently sought a decisive victory.[195] Ludendorff drew up plans (codenamed Operation Michael) for the 1918 offensive on the Western Front. The spring offensive sought to divide the British and French forces with a series of feints and advances. The German leadership hoped to end the war before significant US forces arrived. The operation commenced on 21 March 1918 with an attack on British forces near Saint-Quentin. German forces achieved an unprecedented advance of 60 kilometres (37 mi).[196]

 
French soldiers under General Gouraud, with machine guns amongst the ruins of a church near the Marne, 1918

The initial offensive was so successful that Kaiser Wilhelm II declared 24 March a national holiday. Many Germans thought victory was near. After heavy fighting, however, the offensive was halted. Lacking tanks or motorised artillery, the Germans were unable to consolidate their gains. The problems of re-supply were also exacerbated by increasing distances that now stretched over terrain that was shell-torn and often impassable to traffic.[197]

Following Operation Michael, Germany launched Operation Georgette against the northern English Channel ports. The Allies halted the drive after limited territorial gains by Germany. The German Army to the south then conducted Operations Blücher and Yorck, pushing broadly towards Paris. Germany launched Operation Marne (Second Battle of the Marne) on 15 July, in an attempt to encircle Reims. The resulting counter-attack, which started the Hundred Days Offensive, marked the first successful Allied offensive of the war. By 20 July, the Germans had retreated across the Marne to their starting lines.[198]

Hundred Days Offensive (August–November 1918)

 
Between April and November 1918, the Allies increased their front-line rifle strength while German strength fell by half.[199]

The Allied counteroffensive, known as the Hundred Days Offensive, began on 8 August 1918, with the Battle of Amiens. The battle involved over 400 tanks and 120,000 British, Dominion, and French troops, and by the end of its first day a gap 24 kilometres (15 mi) long had been created in the German lines. The defenders displayed a marked collapse in morale, causing Ludendorff to refer to this day as the "Black Day of the German army".[200][201][202]

Allied advance to the Hindenburg Line
 
An American gun crew from the 23rd Infantry, 2nd Division, firing on German entrenched positions during the Meuse-Argonne offensive, 1918

In September the Allies advanced to the Hindenburg Line in the north and centre. The Germans continued to fight strong rear-guard actions and launched numerous counterattacks, but positions and outposts of the Line continued to fall, with the BEF alone taking 30,441 prisoners in the last week of September. On 24 September an assault by both the British and French came within 3 kilometres (2 mi) of St. Quentin. The Germans had now retreated to positions along or behind the Hindenburg Line. That same day, Supreme Army Command informed the leaders in Berlin that armistice talks were inevitable.[203]

The final assault on the Hindenburg Line began with the Meuse-Argonne offensive, launched by American and French troops on 26 September. The following week, co-operating American and French units broke through in Champagne at the Battle of Blanc Mont Ridge, forcing the Germans off the commanding heights, and closing towards the Belgian frontier.[204] On 8 October the line was pierced again by British and Dominion troops at the Battle of Cambrai.[205]

Breakthrough of Macedonian Front (September 1918)

 
Bulgarian major Ivanov with white flag surrendering to Serbian 7th Danube regiment near Kumanovo

Allied forces started the Vardar offensive on 15 September at two key points: Dobro Pole and near Dojran Lake. In the Battle of Dobro Pole, the Serbian and French armies had success after a three day long battle with relatively small casualties, and subsequently made a breakthrough in the front, something which was rarely seen in World War I. After the front was broken, Allied forces started to liberate Serbia and reached Skopje at 29 September, after which Bulgaria signed an armistice with the Allies on 30 September.[206][207]

Armistices and capitulations

 
Italian troops reach Trento during the Battle of Vittorio Veneto, 1918

The collapse of the Central Powers came swiftly. Bulgaria was the first to sign an armistice, the Armistice of Salonica on 29 September 1918.[208] German Emperor Wilhelm II in a telegram to Bulgarian Tsar Ferdinand I described the situation thus: "Disgraceful! 62,000 Serbs decided the war!".[209][210] On the same day, the German Supreme Army Command informed Kaiser Wilhelm II and the Imperial Chancellor Count Georg von Hertling, that the military situation facing Germany was hopeless.[211]

On 24 October, the Italians began a push that rapidly recovered territory lost after the Battle of Caporetto. This culminated in the Battle of Vittorio Veneto, which marked the end of the Austro-Hungarian Army as an effective fighting force. The offensive also triggered the disintegration of the Austro-Hungarian Empire. During the last week of October, declarations of independence were made in Budapest, Prague, and Zagreb. On 29 October, the imperial authorities asked Italy for an armistice, but the Italians continued advancing, reaching Trento, Udine, and Trieste. On 3 November, Austria-Hungary sent a flag of truce to ask for an armistice (Armistice of Villa Giusti). The terms, arranged by telegraph with the Allied Authorities in Paris, were communicated to the Austrian commander and accepted. The Armistice with Austria was signed in the Villa Giusti, near Padua, on 3 November. Austria and Hungary signed separate armistices following the overthrow of the Habsburg monarchy. In the following days, the Italian Army occupied Innsbruck and all Tyrol with over 20,000 soldiers.[212]

On 30 October, the Ottoman Empire capitulated, signing the Armistice of Mudros.[208]

German Revolution (1918–1919)

 
German Revolution, Kiel, 1918

In northern Germany, the German Revolution of 1918–1919 began at the end of October 1918. Units of the German Navy refused to set sail for a last, large-scale operation in a war they believed to be as good as lost, initiating the uprising. The sailors' revolt, which then ensued in the naval ports of Wilhelmshaven and Kiel, spread across the whole country within days and led to the proclamation of a republic on 9 November 1918, shortly thereafter to the abdication of Kaiser Wilhelm II, and to German surrender.[213][214][215][216]

New German government surrenders

 
Ferdinand Foch, second from right, pictured outside the carriage in Compiègne after agreeing to the armistice that ended the war there.[217]

With the military faltering and with widespread loss of confidence in the Kaiser leading to his abdication and fleeing of the country, Germany moved towards surrender. Prince Maximilian of Baden took charge of a new government on 3 October as Chancellor of Germany to negotiate with the Allies. Negotiations with President Wilson began immediately, in the hope that he would offer better terms than the British and French. Wilson demanded a constitutional monarchy and parliamentary control over the German military.[218] There was no resistance when the Social Democrat Philipp Scheidemann on 9 November declared Germany to be a republic. The Kaiser, kings and other hereditary rulers all were removed from power and Wilhelm fled to exile in the Netherlands. It was the end of Imperial Germany; a new Germany had been born as the Weimar Republic.[219]

On 11 November, at 5:00 am, an armistice with Germany was signed in a railroad carriage at Compiègne. At 11 am on 11 November 1918, a ceasefire came into effect. During the six hours between the signing of the armistice and its taking effect, opposing armies on the Western Front began to withdraw from their positions, but fighting continued along many areas of the front, as commanders wanted to capture territory before the war ended. The occupation of the Rhineland took place following the Armistice.[citation needed]

Aftermath

In the aftermath of the war, four empires disappeared: the German, Austro-Hungarian, Ottoman, and Russian.[n] Numerous nations regained their former independence, and new ones were created. Four dynasties, together with their ancillary aristocracies, fell as a result of the war: the Romanovs, the Hohenzollerns, the Habsburgs, and the Ottomans. Belgium and Serbia were badly damaged, as was France, with 1.4 million soldiers dead,[220] not counting other casualties. Germany and Russia were similarly affected.[221]

Formal end of the war

 
The signing of the Treaty of Versailles in the Hall of Mirrors, Versailles, 28 June 1919, by Sir William Orpen

A formal state of war between the two sides persisted for another seven months, until the signing of the Treaty of Versailles with Germany on 28 June 1919. The United States Senate did not ratify the treaty despite public support for it,[222][223] and did not formally end its involvement in the war until the Knox–Porter Resolution was signed on 2 July 1921 by President Warren G. Harding.[224] For the United Kingdom and the British Empire, the state of war ceased under the provisions of the Termination of the Present War (Definition) Act 1918 with respect to:

  • Germany on 10 January 1920.[225]
  • Austria on 16 July 1920.[226]
  • Bulgaria on 9 August 1920.[227]
  • Hungary on 26 July 1921.[228]
  • Turkey on 6 August 1924.[229]
 
Greek prime minister Eleftherios Venizelos signing the Treaty of Sèvres

After the Treaty of Versailles, treaties with Austria, Hungary, Bulgaria, and the Ottoman Empire were signed. The Ottoman Empire disintegrated, with much of its Levant territory awarded to various Allied powers as protectorates. The Turkish core in Anatolia was reorganised as the Republic of Turkey. The Ottoman Empire was to be partitioned by the Treaty of Sèvres of 1920. This treaty was never ratified by the Sultan and was rejected by the Turkish National Movement, leading to the victorious Turkish War of Independence and the much less stringent 1923 Treaty of Lausanne.[citation needed]

Some war memorials date the end of the war as being when the Versailles Treaty was signed in 1919, which was when many of the troops serving abroad finally returned home; by contrast, most commemorations of the war's end concentrate on the armistice of 11 November 1918.[230] Legally, the formal peace treaties were not complete until the last, the Treaty of Lausanne, was signed. Under its terms, the Allied forces left Constantinople on 23 August 1923.[citation needed]

Peace treaties and national boundaries

 
Map of territorial changes in Europe after World War I (as of 1923)

After the war, there grew a certain amount of academic focus on the causes of war and on the elements that could make peace flourish. In part, these led to the institutionalization of peace and conflict studies, security studies and International Relations (IR) in general.[231] The Paris Peace Conference imposed a series of peace treaties on the Central Powers officially ending the war. The 1919 Treaty of Versailles dealt with Germany and, building on Wilson's 14th point, brought into being the League of Nations on 28 June 1919.[232][233]

The Central Powers had to acknowledge responsibility for "all the loss and damage to which the Allied and Associated Governments and their nationals have been subjected as a consequence of the war imposed upon them by" their aggression. In the Treaty of Versailles, this statement was Article 231. This article became known as the War Guilt clause as the majority of Germans felt humiliated and resentful.[234] Overall the Germans felt they had been unjustly dealt with by what they called the "diktat of Versailles". German historian Hagen Schulze said the Treaty placed Germany "under legal sanctions, deprived of military power, economically ruined, and politically humiliated."[235] Belgian historian Laurence Van Ypersele emphasises the central role played by memory of the war and the Versailles Treaty in German politics in the 1920s and 1930s:

Active denial of war guilt in Germany and German resentment at both reparations and continued Allied occupation of the Rhineland made widespread revision of the meaning and memory of the war problematic. The legend of the "stab in the back" and the wish to revise the "Versailles diktat", and the belief in an international threat aimed at the elimination of the German nation persisted at the heart of German politics. Even a man of peace such as [Gustav] Stresemann publicly rejected German guilt. As for the Nazis, they waved the banners of domestic treason and international conspiracy in an attempt to galvanise the German nation into a spirit of revenge. Like a Fascist Italy, Nazi Germany sought to redirect the memory of the war to the benefit of its own policies.[236]

Meanwhile, new nations liberated from German rule viewed the treaty as recognition of wrongs committed against small nations by much larger aggressive neighbours.[237] The Peace Conference required all the defeated powers to pay reparations for all the damage done to civilians. However, owing to economic difficulties and Germany being the only defeated power with an intact economy, the burden fell largely on Germany.[citation needed]

 
Dissolution of Austria-Hungary after war

Austria-Hungary was partitioned into several successor states, largely but not entirely along ethnic lines. Apart from Austria and Hungary, Czechoslovakia, Italy, Poland, Romania and Yugoslavia received territories from the Dual Monarchy (the formerly separate and autonomous Kingdom of Croatia-Slavonia was incorporated into Yugoslavia). The details were contained in the Saint-Germain-en-Laye and the Treaty of Trianon. As a result, Hungary lost 64% of its total population, decreasing from 20.9 million to 7.6 million and losing 31% (3.3 out of 10.7 million) of its ethnic Hungarians.[238] According to the 1910 census, speakers of the Hungarian language included approximately 54% of the entire population of the Kingdom of Hungary. Within the country, numerous ethnic minorities were present: 16.1% Romanians, 10.5% Slovaks, 10.4% Germans, 2.5% Ruthenians, 2.5% Serbs and 8% others.[239] Between 1920 and 1924, 354,000 Hungarians fled former Hungarian territories attached to Romania, Czechoslovakia, and Yugoslavia.[240]

The Russian Empire, which had withdrawn from the war in 1917 after the October Revolution, lost much of its western frontier as the newly independent nations of Estonia, Finland, Latvia, Lithuania, and Poland were carved from it. Romania took control of Bessarabia in April 1918.[241]

National identities

After 123 years, Poland re-emerged as an independent country. The Kingdom of Serbia and its dynasty, as a "minor Entente nation" and the country with the most casualties per capita,[242][243][244] became the backbone of a new multinational state, the Kingdom of Serbs, Croats and Slovenes, later renamed Yugoslavia. Czechoslovakia, combining the Kingdom of Bohemia with parts of the Kingdom of Hungary, became a new nation. Romania would unite all Romanian-speaking people under a single state leading to Greater Romania.[245] Russia became the Soviet Union and lost Finland, Estonia, Lithuania, and Latvia, which became independent countries. The Ottoman Empire was soon replaced by Turkey and several other countries in the Middle East.[citation needed]

In the British Empire, the war unleashed new forms of nationalism. In Australia and New Zealand, the Battle of Gallipoli became known as those nations' "Baptism of Fire". It was the first major war in which the newly established countries fought, and it was one of the first times that Australian troops fought as Australians, not just subjects of the British Crown, and independent national identities for these nations took hold. Anzac Day, commemorating the Australian and New Zealand Army Corps (ANZAC), celebrates this defining moment.[246][247]

In the aftermath of World War I, Greece fought against Turkish nationalists led by Mustafa Kemal, a war that eventually resulted in a massive population exchange between the two countries under the Treaty of Lausanne.[248] According to various sources,[249] several hundred thousand Greeks died during this period, which was tied in with the Greek genocide.[250]

Health effects

 
Transporting Ottoman wounded at Sirkeci

Of the 60 million European military personnel who were mobilised from 1914 to 1918, 8 million were killed, 7 million were permanently disabled, and 15 million were seriously injured. Germany lost 15.1% of its active male population, Austria-Hungary lost 17.1%, and France lost 10.5%.[251] France mobilised 7.8 million men, of which 1.4 million died and 3.2 million were injured.[252] Among the soldiers mutilated and surviving in the trenches, approximately 15,000 sustained horrific facial injuries, causing them to undergo social stigma and marginalisation; they were called the gueules cassées. In Germany, civilian deaths were 474,000 higher than in peacetime, due in large part to food shortages and malnutrition that weakened resistance to disease. These excess deaths are estimated as 271,000 in 1918, plus another 71,000 in the first half of 1919 when the blockade was still in effect.[253] By the end of the war, starvation caused by famine had killed approximately 100,000 people in Lebanon.[254] Between 5 and 10 million people died in the Russian famine of 1921.[255] By 1922, there were between 4.5 million and 7 million homeless children in Russia as a result of nearly a decade of devastation from World War I, the Russian Civil War, and the subsequent famine of 1920–1922.[256] Numerous anti-Soviet Russians fled the country after the Revolution; by the 1930s, the northern Chinese city of Harbin had 100,000 Russians.[257] Thousands more emigrated to France, England, and the United States.

 
Emergency military hospital during the Spanish flu pandemic, which killed about 675,000 people in the United States alone, Camp Funston, Kansas, 1918

Diseases flourished in the chaotic wartime conditions. In 1914 alone, louse-borne epidemic typhus killed 200,000 in Serbia.[258] From 1918 to 1922, Russia had about 25 million infections and 3 million deaths from epidemic typhus.[259] In 1923, 13 million Russians contracted malaria, a sharp increase from the pre-war years.[260] Starting in early 1918, a major influenza epidemic known as Spanish flu spread around the world, accelerated by the movement of large number of soldiers, often crammed together in camps and transport ships with poor sanitation. Overall, the Spanish flu killed at least 17 million to 25 million people,[261][262] including an estimated 2.64 million Europeans and as many as 675,000 Americans.[263] Moreover, between 1915 and 1926, an epidemic of encephalitis lethargica spread around the world affecting nearly five million people.[264][265]

War crimes

Rape of Belgium

The German invaders treated any resistance—such as sabotaging rail lines—as illegal and immoral, and shot the offenders and burned buildings in retaliation. In addition, they tended to suspect that most civilians were potential francs-tireurs (guerrillas) and, accordingly, took and sometimes killed hostages from among the civilian population. The German army executed over 6,500 French and Belgian civilians between August and November 1914, usually in near-random large-scale shootings of civilians ordered by junior German officers. The German Army destroyed 15,000–20,000 buildings—most famously the university library at Leuven—and generated a wave of refugees of over a million people. Over half the German regiments in Belgium were involved in major incidents.[266] Thousands of workers were shipped to Germany to work in factories. British propaganda dramatising the Rape of Belgium attracted much attention in the United States, while Berlin said it was both lawful and necessary because of the threat of franc-tireurs like those in France in 1870.[267] The British and French magnified the reports and disseminated them at home and in the United States, where they played a major role in dissolving support for Germany.[268][269]

Austro-Hungarian war crimes in Serbia

 
Austro-Hungarian soldiers executing men and women in Serbia, 1916[270]

Austria's propaganda machinery spread anti-Serb sentiment with the slogan "Serbien muss sterbien" (Serbia must die).[271] During the war Austro-Hungarian officers in Serbia ordered troops to "exterminate and burn everything that is Serbian", and hangings and mass shootings were everyday occurrences.[271] Austrian historian, Anton Holzer, wrote that the Austro-Hungarian army carried out "countless and systematic massacres…against the Serbian population. The soldiers invaded villages and rounded up unarmed men, women and children. They were either shot dead, bayoneted to death or hanged. The victims were locked into barns and burned alive. Women were sent up to the front lines and mass-raped. The inhabitants of whole villages were taken as hostages and humiliated and tortured."[272]

A claim from a local spy that "traitors" were hiding in a certain house was enough to sentence the whole family to death by hanging. Priests were often hanged, under the accusation of spreading the spirit of treason among the people. Multiple source state that 30,000 Serbs, mostly civilians, were hanged by Austro-Hungarian forces in the first year of the war alone.[271]

Baralong incidents

 
HMS Baralong

On 19 August 1915, the German submarine U-27 was sunk by the British Q-ship HMS Baralong. All German survivors were summarily executed by Baralong's crew on the orders of Lieutenant Godfrey Herbert, the captain of the ship. The shooting was reported to the media by American citizens who were on board the Nicosia, a British freighter loaded with war supplies, which was stopped by U-27 just minutes before the incident.[273]

On 24 September, Baralong destroyed U-41, which was in the process of sinking the cargo ship Urbino. According to Karl Goetz, the submarine's commander, Baralong continued to fly the US flag after firing on U-41 and then rammed the lifeboat carrying the German survivors, sinking it.[274]

Torpedoing of HMHS Llandovery Castle

The Canadian hospital ship HMHS Llandovery Castle was torpedoed by the German submarine SM U-86 on 27 June 1918 in violation of international law. Only 24 of the 258 medical personnel, patients, and crew survived. Survivors reported that the U-boat surfaced and ran down the lifeboats, machine-gunning survivors in the water. The U-boat captain, Helmut Brümmer-Patzig, was charged with war crimes in Germany following the war, but escaped prosecution by going to the Free City of Danzig, beyond the jurisdiction of German courts.[275]

Blockade of Germany

After the war, the German government claimed that approximately 763,000 German civilians died from starvation and disease during the war because of the Allied blockade.[276][277] An academic study done in 1928 put the death toll at 424,000.[278] Germany protested that the Allies had used starvation as a weapon of war.[279] Sally Marks argued that the German accounts of a hunger blockade are a "myth", as Germany did not face the starvation level of Belgium and the regions of Poland and northern France that it occupied.[280] According to the British judge and legal philosopher Patrick Devlin, "The War Orders given by the Admiralty on 26 August [1914] were clear enough. All food consigned to Germany through neutral ports was to be captured and all food consigned to Rotterdam was to be presumed consigned to Germany." According to Devlin, this was a serious breach of International Law, equivalent to German minelaying.[281]

Chemical weapons in warfare

 
French soldiers making a gas and flame attack on German trenches in Flanders

The German army was the first to successfully deploy chemical weapons during the Second Battle of Ypres (22 April – 25 May 1915), after German scientists working under the direction of Fritz Haber at the Kaiser Wilhelm Institute developed a method to weaponize chlorine.[o][282] The use of chemical weapons was sanctioned by the German High Command in an effort to force Allied soldiers out of their entrenched positions, complementing rather than supplanting more lethal conventional weapons.[282] In time, chemical weapons were deployed by all major belligerents throughout the war, inflicting approximately 1.3 million casualties, but relatively few fatalities: About 90,000 in total.[282] For example, there were an estimated 186,000 British chemical weapons casualties during the war (80% of which were the result of exposure to the vesicant sulfur mustard, introduced to the battlefield by the Germans in July 1917, which burns the skin at any point of contact and inflicts more severe lung damage than chlorine or phosgene),[282] and up to one-third of American casualties were caused by them. The Russian Army reportedly suffered roughly 500,000 chemical weapon casualties in World War I.[283] The use of chemical weapons in warfare was in direct violation of the 1899 Hague Declaration Concerning Asphyxiating Gases and the 1907 Hague Convention on Land Warfare, which prohibited their use.[284][285]

The effect of poison gas was not limited to combatants. Civilians were at risk from the gases as winds blew the poison gases through their towns, and they rarely received warnings or alerts of potential danger. In addition to absent warning systems, civilians often did not have access to effective gas masks. An estimated 100,000–260,000 civilian casualties were caused by chemical weapons during the conflict and tens of thousands more (along with military personnel) died from scarring of the lungs, skin damage, and cerebral damage in the years after the conflict ended. Many commanders on both sides knew such weapons would cause major harm to civilians but nonetheless continued to use them. British Field Marshal Douglas Haig wrote in his diary, "My officers and I were aware that such weapons would cause harm to women and children living in nearby towns, as strong winds were common in the battlefront. However, because the weapon was to be directed against the enemy, none of us were overly concerned at all."[286][287][288][289]

The war damaged the prestige of chemistry in European societies, in particular the German variety.[290]

Massacres of Albanians

During the Balkan Wars, Albanians were massacred by members of the Balkan League, mostly by Serbian and Montenegrin forces. These massacres continued during the First World War as foreign armies entered Albania. Bulgarian, Serbian, Montenegrin, and Greek forces committed several atrocities in Albania, during occupation, and in other regions inhabited by Albanians. Many villages were burned and destroyed, leaving 330,000 people without homes by 1915.[291] According to the Committee of Kosovo, 50,000 Albanians were killed by Bulgarian forces and around 200,000 Albanians were killed by Serbian and Montenegrin forces.[292]

Genocide and ethnic cleansing

Ottoman Empire

 
Armenians killed during the Armenian genocide. Image taken from Ambassador Morgenthau's Story, written by Henry Morgenthau Sr. and published in 1918.[293]

The ethnic cleansing of the Ottoman Empire's Armenian population, including mass deportations and executions, during the final years of the Ottoman Empire is considered genocide.[294] The Ottomans carried out organised and systematic massacres of the Armenian population at the beginning of the war and manipulated acts of Armenian resistance by portraying them as rebellions to justify further extermination.[295] In early 1915, a number of Armenians volunteered to join the Russian forces and the Ottoman government used this as a pretext to issue the Tehcir Law (Law on Deportation), which authorised the deportation of Armenians from the Empire's eastern provinces to Syria between 1915 and 1918. The Armenians were intentionally marched to death and a number were attacked by Ottoman brigands.[296] While an exact number of deaths is unknown, the International Association of Genocide Scholars estimates 1.5 million.[294][297] The government of Turkey has consistently denied the genocide, arguing that those who died were victims of inter-ethnic fighting, famine, or disease during World War I; these claims are rejected by most historians.[298]

Other ethnic groups were similarly attacked by the Ottoman Empire during this period, including Assyrians and Greeks, and some scholars consider those events to be part of the same policy of extermination.[299][300][301] At least 250,000 Assyrian Christians, about half of the population, and 350,000–750,000 Anatolian and Pontic Greeks were killed between 1915 and 1922.[302]

Russian Empire

Many pogroms accompanied the Russian Revolution of 1917 and the ensuing Russian Civil War. 60,000–200,000 civilian Jews were killed in the atrocities throughout the former Russian Empire (mostly within the Pale of Settlement in present-day Ukraine).[303] There were an estimated 7–12 million casualties during the Russian Civil War, mostly civilians.[304]

Soldiers' experiences

Allied personnel was around 42,928,000 while Central personnel was near 25,248,000.[221][305] The British soldiers of the war were initially volunteers but increasingly were conscripted into service. Surviving veterans, returning home, often found they could discuss their experiences only amongst themselves. Grouping together, they formed "veterans' associations" or "Legions". A small number of personal accounts of American veterans have been collected by the Library of Congress Veterans History Project.[306]

Prisoners of war

 
German prisoners in a French prison camp during the later part of the war

About eight million soldiers surrendered and were held in POW camps during the war. All nations pledged to follow the Hague Conventions on fair treatment of prisoners of war, and the survival rate for POWs was generally much higher than that of combatants at the front.[307]

Individual surrenders were uncommon; large units usually surrendered en masse. At the siege of Maubeuge about 40,000 French soldiers surrendered, at the battle of Galicia Russians took about 100,000 to 120,000 Austrian captives, at the Brusilov Offensive about 325,000 to 417,000 Germans and Austrians surrendered to Russians, and at the Battle of Tannenberg, 92,000 Russians surrendered. When the besieged garrison of Kaunas surrendered in 1915, some 20,000 Russians became prisoners, at the battle near Przasnysz (February–March 1915) 14,000 Germans surrendered to Russians, and at the First Battle of the Marne about 12,000 Germans surrendered to the Allies.[citation needed]

25–31% of Russian losses (as a proportion of those captured, wounded, or killed) were to prisoner status, for Austria-Hungary 32%, for Italy 26%, for France 12%, for Germany 9%; for Britain 7%. Prisoners from the Allied armies totalled about 1.4 million (not including Russia, which lost 2.5–3.5 million soldiers as prisoners). From the Central Powers about 3.3 million soldiers became prisoners; most of them surrendered to Russians.[308] Germany held 2.5 million prisoners; Russia held 2.2–2.9 million; while Britain and France held about 720,000. Most were captured just before the Armistice. The United States held 48,000.[citation needed]

The most dangerous moment was the act of surrender when helpless soldiers were sometimes gunned down.[309][310] Once prisoners reached a camp, conditions were, in general, satisfactory (and much better than in World War II), thanks in part to the efforts of the International Red Cross and inspections by neutral nations. However, conditions were terrible in Russia. Starvation was common for prisoners and civilians alike. About 15–20% of the prisoners in Russia died, and in Central Powers imprisonment 8% of Russians.[311] In Germany, food was scarce, but only 5% died.[312][313][314]

 
British prisoners guarded by Ottoman forces after the First Battle of Gaza in 1917

The Ottoman Empire often treated POWs poorly.[315] Some 11,800 British Empire soldiers, most of them Indians, became prisoners after the siege of Kut in Mesopotamia in April 1916; 4,250 died in captivity.[316] Although many were in a poor condition when captured, Ottoman officers forced them to march 1,100 kilometres (684 mi) to Anatolia. A survivor said: "We were driven along like beasts; to drop out was to die."[317] The survivors were then forced to build a railway through the Taurus Mountains.

While the Allied prisoners of the Central Powers were quickly sent home at the end of active hostilities, the same treatment was not granted to Central Power prisoners of the Allies and Russia, many of whom served as forced labour, e.g., in France until 1920. They were released only after many approaches by the Red Cross to the Supreme War Council.[318] German prisoners were still being held in Russia as late as 1924.[319]

Military attachés and war correspondents

Military and civilian observers from every major power closely followed the course of the war. Many were able to report on events from a perspective somewhat akin to modern "embedded" positions within the opposing land and naval forces.

Conscription

Conscription was common in most European countries. However, it was controversial in English-speaking countries. It was especially unpopular among minority ethnic groups—especially the Irish Catholics in Ireland and Australia, and the French Catholics in Canada.[320]

Canada

In Canada, the issue produced a major political crisis that permanently alienated the Francophones. It opened a political gap between French Canadians, who believed their true loyalty was to Canada and not to the British Empire, and members of the Anglophone majority, who saw the war as a duty to their British heritage.[321]

Australia

 
Military recruitment in Melbourne, Australia, 1914

Australia had a form of conscription at the outbreak of the war, as compulsory military training had been introduced in 1911. However, the Defence Act 1903 provided that unexempted males could be called upon only for home defence during times of war, not overseas service. Prime Minister Billy Hughes wished to amend the legislation to require conscripts to serve overseas, and held two non-binding referendums – one in 1916 and again in 1917 – in order to secure public support.[322] Both were defeated by narrow margins, with farmers, the labour movement, the Catholic Church, and Irish-Australians combining to campaign for the "No" vote.[323] The issue of conscription caused the 1916 Australian Labor Party split. Hughes and his supporters were expelled from the party, forming the National Labor Party and then the Nationalist Party. Despite the referendum results, the Nationalists won a landslide victory at the 1917 federal election.[322]

Britain

 
British volunteer recruits in London, August 1914

In Britain, conscription resulted in the calling up of nearly every physically fit man in Britain—six of ten million eligible. Of these, about 750,000 died. Most deaths were those of young unmarried men; however, 160,000 wives lost husbands and 300,000 children lost fathers.[324] Conscription during the First World War began when the British government passed the Military Service Act in 1916. The act specified that single men aged 18 to 40 years old were liable to be called up for military service unless they were widowed, with children, or ministers of a religion. There was a system of Military Service Tribunals to adjudicate upon claims for exemption upon the grounds of performing civilian work of national importance, domestic hardship, health, and conscientious objection. The law went through several changes before the war ended. Married men were exempt in the original Act, although this was changed in June 1916. The age limit was also eventually raised to 51 years old. Recognition of work of national importance also diminished, and in the last year of the war, there was some support for the conscription of clergy.[325]

United States

 
A United States Army recruiting poster shows Uncle Sam pointing his finger at the viewer to try and persuade them to enlist in the U.S. Army during World War I.

In the United States, conscription began in 1917 and was generally well received, with a few pockets of opposition in isolated rural areas.[326] The administration decided to rely primarily on conscription, rather than voluntary enlistment, to raise military manpower after only 73,000 volunteers enlisted out of the initial 1 million target in the first six weeks of the war.[327] In 1917 10 million men were registered. This was deemed to be inadequate, so age ranges were increased and exemptions reduced, and so by the end of 1918 this increased to 24 million men that were registered with nearly 3 million inducted into the military services. The draft was universal and included blacks on the same terms as whites, although they served in different units. In all 367,710 black Americans were drafted (13% of total), compared to 2,442,586 white (87% of total).[citation needed]

Austria-Hungary

Like all the armies of mainland Europe, Austria-Hungary relied on conscription to fill its ranks. Officer recruitment, however, was voluntary. The effect of this at the start of the war was that well over a quarter of the rank and file were Slavs, while more than 75% of the officers were ethnic Germans. This was much resented. The army has been described as being "run on colonial lines" and the Slav soldiers as "disaffected". Thus conscription contributed greatly to Austria's disastrous performance on the battlefield.[328]

Economic effects

Macro- and micro-economic consequences devolved from the war. Families were altered by the departure of many men. With the death or absence of the primary wage earner, women were forced into the workforce in unprecedented numbers. At the same time, industry needed to replace the lost labourers sent to war. This aided the struggle for voting rights for women.[329]

 
Poster showing women workers, 1915

In all nations, the government's share of GDP increased, surpassing 50% in both Germany and France and nearly reaching that level in Britain. To pay for purchases in the United States, Britain cashed in its extensive investments in American railroads and then began borrowing heavily from Wall Street. President Wilson was on the verge of cutting off the loans in late 1916 but allowed a great increase in US government lending to the Allies. After 1919, the US demanded repayment of these loans. The repayments were, in part, funded by German reparations that, in turn, were supported by American loans to Germany. This circular system collapsed in 1931 and some loans were never repaid. Britain still owed the United States $4.4 billion[p] of World War I debt in 1934; the last installment was finally paid in 2015.[330]

Britain turned to her colonies for help in obtaining essential war materials whose supply from traditional sources had become difficult. Geologists such as Albert Kitson were called on to find new resources of precious minerals in the African colonies. Kitson discovered important new deposits of manganese, used in munitions production, in the Gold Coast.[331]

Article 231 of the Treaty of Versailles (the so-called "war guilt" clause) stated Germany accepted responsibility for "all the loss and damage to which the Allied and Associated Governments and their nationals have been subjected as a consequence of the war imposed upon them by the aggression of Germany and her allies."[332] It was worded as such to lay a legal basis for reparations, and a similar clause was inserted in the treaties with Austria and Hungary. However, neither of them interpreted it as an admission of war guilt."[333] In 1921, the total reparation sum was placed at 132 billion gold marks. However, "Allied experts knew that Germany could not pay" this sum. The total sum was divided into three categories, with the third being "deliberately designed to be chimerical" and its "primary function was to mislead public opinion ... into believing the "total sum was being maintained."[334] Thus, 50 billion gold marks (12.5 billion dollars) "represented the actual Allied assessment of German capacity to pay" and "therefore … represented the total German reparations" figure that had to be paid.[334]

This figure could be paid in cash or in-kind (coal, timber, chemical dyes, etc.). In addition, some of the territory lost—via the treaty of Versailles—was credited towards the reparation figure as were other acts such as helping to restore the Library of Louvain.[335] By 1929, the Great Depression arrived, causing political chaos throughout the world.[336] In 1932 the payment of reparations was suspended by the international community, by which point Germany had paid only the equivalent of 20.598 billion gold marks in reparations.[337] With the rise of Adolf Hitler, all bonds and loans that had been issued and taken out during the 1920s and early 1930s were cancelled. David Andelman notes "refusing to pay doesn't make an agreement null and void. The bonds, the agreement, still exist." Thus, following the Second World War, at the London Conference in 1953, Germany agreed to resume payment on the money borrowed. On 3 October 2010, Germany made the final payment on these bonds.[q]

The Australian prime minister, Billy Hughes, wrote to the British prime minister, David Lloyd George, "You have assured us that you cannot get better terms. I much regret it, and hope even now that some way may be found of securing agreement for demanding reparation commensurate with the tremendous sacrifices made by the British Empire and her Allies." Australia received £5,571,720 war reparations, but the direct cost of the war to Australia had been £376,993,052, and, by the mid-1930s, repatriation pensions, war gratuities, interest and sinking fund charges were £831,280,947.[342] Of about 416,000 Australians who served, about 60,000 were killed and another 152,000 were wounded.[221]

The war contributed to the evolution of the wristwatch from women's jewellery to a practical everyday item, replacing the pocketwatch, which requires a free hand to operate.[343] Trench watches were designed for use by the military as pocket watches were not as effective for combat. Military funding of advancements in radio contributed to the post-war popularity of the medium.[343]

Support and opposition for the war

Support

 
Poster urging women to join the British war effort, published by the Young Women's Christian Association

In the Balkans, Yugoslav nationalists such as the leader, Ante Trumbić, strongly supported the war, desiring the freedom of Yugoslavs from Austria-Hungary and other foreign powers and the creation of an independent Yugoslavia. The Yugoslav Committee, led by Trumbić, was formed in Paris on 30 April 1915 but shortly moved its office to London.[344] In April 1918, the Rome Congress of Oppressed Nationalities met, including Czechoslovak, Italian, Polish, Transylvanian, and Yugoslav representatives who urged the Allies to support national self-determination for the peoples residing within Austria-Hungary.[345]

In the Middle East, Arab nationalism soared in Ottoman territories in response to the rise of Turkish nationalism during the war, with Arab nationalist leaders advocating the creation of a pan-Arab state. In 1916, the Arab Revolt began in Ottoman-controlled territories of the Middle East in an effort to achieve independence.[346]

In East Africa, Iyasu V of Ethiopia was supporting the Dervish state who were at war with the British in the Somaliland campaign.[347] Von Syburg, the German envoy in Addis Ababa, said, "now the time has come for Ethiopia to regain the coast of the Red Sea driving the Italians home, to restore the Empire to its ancient size." The Ethiopian Empire was on the verge of entering World War I on the side of the Central Powers before Iyasu's overthrow at the Battle of Segale due to Allied pressure on the Ethiopian aristocracy.[348] Iyasu was accused of converting to Islam.[349] According to Ethiopian historian Bahru Zewde, the evidence used to prove Iyasu's conversion was a doctored photo of Iyasu wearing a turban provided by the Allies.[350] Some historians claim the British spy T. E. Lawrence forged the Iyasu photo.[351]

 
Bermuda Volunteer Rifle Corps First Contingent in Bermuda, winter 1914–1915, before joining 1 Lincolnshire Regiment in France in June 1915. The dozen remaining after Guedecourt on 25 September 1916, merged with a Second Contingent. The two contingents suffered 75% casualties.

A number of socialist parties initially supported the war when it began in August 1914.[345] But European socialists split on national lines, with the concept of class conflict held by radical socialists such as Marxists and syndicalists being overborne by their patriotic support for the war.[352] Once the war began, Austrian, British, French, German, and Russian socialists followed the rising nationalist current by supporting their countries' intervention in the war.[353]

Italian nationalism was stirred by the outbreak of the war and was initially strongly supported by a variety of political factions. One of the most prominent and popular Italian nationalist supporters of the war was Gabriele D'Annunzio, who promoted Italian irredentism and helped sway the Italian public to support intervention in the war.[354] The Italian Liberal Party, under the leadership of Paolo Boselli, promoted intervention in the war on the side of the Allies and used the Dante Alighieri Society to promote Italian nationalism.[355] Italian socialists were divided on whether to support the war or oppose it; some were militant supporters of the war, including Benito Mussolini and Leonida Bissolati.[356] However, the Italian Socialist Party decided to oppose the war after anti-militarist protestors were killed, resulting in a general strike called Red Week.[357] The Italian Socialist Party purged itself of pro-war nationalist members, including Mussolini.[357] Mussolini, a syndicalist who supported the war on grounds of irredentist claims on Italian-populated regions of Austria-Hungary, formed the pro-interventionist Il Popolo d'Italia and the Fasci Rivoluzionario d'Azione Internazionalista ("Revolutionary Fasci for International Action") in October 1914 that later developed into the Fasci Italiani di Combattimento in 1919, the origin of fascism.[358] Mussolini's nationalism enabled him to raise funds from Ansaldo (an armaments firm) and other companies to create Il Popolo d'Italia to convince socialists and revolutionaries to support the war.[359]

Patriotic Funds

On both sides there was large scale fundraising for soldiers' welfare, their dependents and for those injured. The Nail Men were a German example. Around the British empire there were many Patriotic Funds, including the Royal Patriotic Fund Corporation, Canadian Patriotic Fund, Queensland Patriotic Fund and, by 1919, there were 983 funds in New Zealand.[360] At the start of the next world war the New Zealand funds were reformed, having been criticised as overlapping, wasteful and abused,[361] but 11 were still functioning in 2002.[362]

Opposition

 
The Deserter, 1916: Anti-war cartoon depicting Jesus facing a firing squad with soldiers from five European countries.

Many countries jailed those who spoke out against the conflict. These included Eugene Debs in the United States and Bertrand Russell in Britain. In the US, the Espionage Act of 1917 and Sedition Act of 1918 made it a federal crime to oppose military recruitment or make any statements deemed "disloyal". Publications at all critical of the government were removed from circulation by postal censors,[363] and many served long prison sentences for statements of fact deemed unpatriotic.

 
Sackville Street (now O'Connell Street) after the 1916 Easter Rising in Dublin

A number of nationalists opposed intervention, particularly within states that the nationalists were hostile to. Although the vast majority of Irish people consented to participate in the war in 1914 and 1915, a minority of advanced Irish nationalists staunchly opposed taking part.[364] The war began amid the Home Rule crisis in Ireland that had resurfaced in 1912, and by July 1914 there was a serious possibility of an outbreak of civil war in Ireland. Irish nationalists and Marxists attempted to pursue Irish independence, culminating in the Easter Rising of 1916, with Germany sending 20,000 rifles to Ireland to stir unrest in Britain.[365] The UK government placed Ireland under martial law in response to the Easter Rising, though once the immediate threat of revolution had dissipated, the authorities did try to make concessions to nationalist feeling.[366] However, opposition to involvement in the war increased in Ireland, resulting in the Conscription Crisis of 1918.

Other opposition came from conscientious objectors—some socialist, some religious—who refused to fight. In Britain, 16,000 people asked for conscientious objector status.[367] Some of them, most notably prominent peace activist Stephen Hobhouse, refused both military and alternative service.[368] Many suffered years of prison, including solitary confinement and bread and water diets. Even after the war, in Britain many job advertisements were marked "No conscientious objectors need apply".[369]

On 1–4 May 1917, about 100,000 workers and soldiers of Petrograd, and after them, the workers and soldiers of other Russian cities, led by the Bolsheviks, demonstrated under banners reading "Down with the war!" and "all power to the soviets!" The mass demonstrations resulted in a crisis for the Russian Provisional Government.[370] In Milan, in May 1917, Bolshevik revolutionaries organised and engaged in rioting calling for an end to the war, and managed to close down factories and stop public transportation.[371] The Italian army was forced to enter Milan with tanks and machine guns to face Bolsheviks and anarchists, who fought violently until 23 May when the army gained control of the city. Almost 50 people (including three Italian soldiers) were killed and over 800 people arrested.[371]

Technology

Ground warfare

 
Tanks on parade in London at the end of World War I

World War I began as a clash of 20th-century technology and 19th-century tactics, with the inevitably large ensuing casualties. By the end of 1917, however, the major armies, now numbering millions of men, had modernised and were making use of telephone, wireless communication,[372] armoured cars, tanks (especially with the advent of the first prototype tank, Little Willie), and aircraft.[373]

Artillery also underwent a revolution. In 1914, cannons were positioned in the front line and fired directly at their targets. By 1917, indirect fire with guns (as well as mortars and even machine guns) was commonplace, using new techniques for spotting and ranging, notably, aircraft and the often overlooked field telephone.[374]

 
38-cm "Lange Max" of Koekelare (Leugenboom), the biggest gun in the world in 1917

Germany was far ahead of the Allies in using heavy indirect fire. The German Army employed 150 mm (6 in) and 210 mm (8 in) howitzers in 1914, when typical French and British guns were only 75 mm (3 in) and 105 mm (4 in). The British had a 6-inch (152 mm) howitzer, but it was so heavy it had to be hauled to the field in pieces and assembled. The Germans also fielded Austrian 305 mm (12 in) and 420 mm (17 in) guns and, even at the beginning of the war, had inventories of various calibres of Minenwerfer, which were ideally suited for trench warfare.[375][376]

Much of the combat involved trench warfare, in which hundreds often died for each metre gained. Many of the deadliest battles in history occurred during World War I. Such battles include Ypres, the Marne, Cambrai, the Somme, Verdun, and Gallipoli. The Germans employed the Haber process of nitrogen fixation to provide their forces with a constant supply of gunpowder despite the British naval blockade.[377] Artillery was responsible for the largest number of casualties and consumed vast quantities of explosives.[378]

 
A Canadian soldier with mustard gas burns, c. 1917–1918

The widespread use of chemical warfare was a distinguishing feature of the conflict. Gases used included chlorine, mustard gas and phosgene. Relatively few war casualties were caused by gas,[379] as effective countermeasures to gas attacks were quickly created, such as gas masks. The use of chemical warfare and small-scale strategic bombing (as opposed to tactical bombing) were both outlawed by the Hague Conventions of 1899 and 1907, and both proved to be of limited effectiveness,[380] though they captured the public imagination.[381] The most powerful land-based weapons were railway guns, weighing dozens of tons apiece.[382]

 
British Vickers machine gun, 1917

Naval

 
The Moltke-class SMS Goeben

Germany deployed U-boats (submarines) after the war began. Alternating between restricted and unrestricted submarine warfare in the Atlantic, the Imperial German Navy employed them to deprive the British Isles of vital supplies. The deaths of British merchant sailors and the seeming invulnerability of U-boats led to the development of depth charges (1916), hydrophones (sonar, 1917), blimps, hunter-killer submarines (HMS R-1, 1917), forward-throwing anti-submarine weapons, and dipping hydrophones (the latter two both abandoned in 1918).[109] To extend their operations, the Germans proposed supply submarines (1916). Most of these would be forgotten in the interwar period until World War II revived the need.[383]

Aviation

 
Royal Air Force Sopwith Camel. In April 1917, the average life expectancy of a British pilot on the Western Front was 93 flying hours.[384]

Fixed-wing aircraft were first used militarily by the Italians in Libya on 23 October 1911 during the Italo-Turkish War for reconnaissance, soon followed by the dropping of grenades and aerial photography the next year. By 1914, their military utility was obvious. They were initially used for reconnaissance and ground attack. To shoot down enemy planes, anti-aircraft guns and fighter aircraft were developed. Strategic bombers were created, principally by the Germans and British, though the former used Zeppelins as well.[385] Towards the end of the conflict, aircraft carriers were used for the first time, with HMS Furious launching Sopwith Camels in a raid to destroy the Zeppelin hangars at Tønder in 1918.[386]

 
Luftstreitkräfte Fokker Dr.I being inspected by Manfred von Richthofen, also known as the Red Baron.

Manned observation balloons, floating high above the trenches, were used as stationary reconnaissance platforms, reporting enemy movements and directing artillery. Balloons commonly had a crew of two, equipped with parachutes,[387] so that if there was an enemy air attack the crew could parachute to safety. At the time, parachutes were too heavy to be used by pilots of aircraft (with their marginal power output), and smaller versions were not developed until the end of the war; they were also opposed by the British leadership, who feared they might promote cowardice.[388]

Recognised for their value as observation platforms, balloons were important targets for enemy aircraft. To defend them against air attack, they were heavily protected by anti-aircraft guns and patrolled by friendly aircraft; to attack them, unusual weapons such as air-to-air rockets were tried. Thus, the reconnaissance value of blimps and balloons contributed to the development of air-to-air combat between all types of aircraft, and to the trench stalemate, because it was impossible to move large numbers of troops undetected. The Germans conducted air raids on England during 1915 and 1916 with airships, hoping to damage British morale and cause aircraft to be diverted from the front lines, and indeed the resulting panic led to the diversion of several squadrons of fighters from France.[385][388]

Radio telecommunication

 
Mobile radio station in German South West Africa, using a hydrogen balloon to lift the antenna

The introduction of radio telegraphy was a significant step in communication during World War I. The stations utilised at that time were spark-gap transmitters. As an example, the information of the start of World War I was transmitted to German South West Africa on 2 August 1914 via radio telegraphy from the Nauen transmitter station via a relay station in Kamina and Lomé in Togo to the radio station in Windhoek.[citation needed]

Diplomacy

 
1917 political cartoon about the Zimmermann Telegram. The message was intercepted by the British; its publication caused outrage and contributed to the U.S. entry into World War I.

The non-military diplomatic and propaganda interactions among the nations were designed to build support for the cause or to undermine support for the enemy. For the most part, wartime diplomacy focused on five issues: propaganda campaigns; defining and redefining the war goals, which became harsher as the war went on; luring neutral nations (Italy, Ottoman Empire, Bulgaria, Romania) into the coalition by offering slices of enemy territory; and encouragement by the Allies of nationalistic minority movements inside the Central Powers, especially among Czechs, Poles, and Arabs. In addition, there were multiple peace proposals coming from neutrals, or one side or the other; none of them progressed very far.[389][390][391]

Legacy and memory

... "Strange, friend," I said, "Here is no cause to mourn."
"None," said the other, "Save the undone years"... 

— Wilfred Owen, Strange Meeting, 1918[392]

The first tentative efforts to comprehend the meaning and consequences of modern warfare began during the initial phases of the war, and this process continued throughout and after the end of hostilities, and is still underway, more than a century later. As late as 2007, signs warning visitors to keep off certain paths at battlefield sites like Verdun and Somme remained in place as unexploded ordnance continued to pose a danger to farmers living near former battlegrounds. In France and Belgium locals who discover caches of unexploded munitions are assisted by weapons disposal units. In some places, plant life has still not returned to normal.[393]

Historiography

Teaching World War I has presented special challenges. When compared with World War II, the First World War is often thought to be "a wrong war fought for the wrong reasons". It lacks the metanarrative of good versus evil that characterizes the Second World War. Lacking recognizable heroes and villains, it is often taught thematically, invoking tropes like the wastefulness of war, the folly of generals and the innocence of soldiers. The complexity of the conflict is mostly obscured by these oversimplifications.[393] George Kennan referred to the war as the "seminal catastrophe of the 20th century".[394]

Historian Heather Jones argues that the historiography has been reinvigorated by the cultural turn in recent years. Scholars have raised entirely new questions regarding military occupation, radicalisation of politics, race, medical science, gender and mental health. Furthermore, new research has revised our understanding of five major topics that historians have long debated: Why the war began, why the Allies won, whether generals were responsible for high casualty rates, how the soldiers endured the horrors of trench warfare, and to what extent the civilian homefront accepted and endorsed the war effort.[395][396]

Memorials

 
The Italian Redipuglia War Memorial, which contains the remains of 100,187 soldiers

Memorials were erected in thousands of villages and towns. Close to battlefields, those buried in improvised burial grounds were gradually moved to formal graveyards under the care of organisations such as the Commonwealth War Graves Commission, the American Battle Monuments Commission, the German War Graves Commission, and Le Souvenir français. Many of these graveyards also have central monuments to the missing or unidentified dead, such as the Menin Gate Memorial to the Missing and the Thiepval Memorial to the Missing of the Somme.[citation needed]

In 1915, John McCrae, a Canadian army doctor, wrote the poem In Flanders Fields as a salute to those who perished in the Great War. Published in Punch on 8 December 1915, it is still recited today, especially on Remembrance Day and Memorial Day.[397][398]

 
A typical village war memorial to soldiers killed in World War I

National World War I Museum and Memorial in Kansas City, Missouri, is a memorial dedicated to all Americans who served in World War I. The Liberty Memorial was dedicated on 1 November 1921, when the supreme Allied commanders spoke to a crowd of more than 100,000 people.[399]

The UK Government has budgeted substantial resources to the commemoration of the war during the period 2014 to 2018. The lead body is the Imperial War Museum.[400] On 3 August 2014, French President François Hollande and German President Joachim Gauck together marked the centenary of Germany's declaration of war on France by laying the first stone of a memorial in Vieil Armand, known in German as Hartmannswillerkopf, for French and German soldiers killed in the war.[401] During the Armistice centenary commemorations, French President Emmanuel Macron and German Chancellor Angela Merkel visited the site of the signing of the Armistice of Compiègne and unveiled a plaque to reconciliation.[402]

Cultural memory

World War I had a lasting impact on collective memory. It was seen by many in Britain as signalling the end of an era of stability stretching back to the Victorian period, and across Europe many regarded it as a watershed.[403] Historian Samuel Hynes explained:

A generation of innocent young men, their heads full of high abstractions like Honour, Glory and England, went off to war to make the world safe for democracy. They were slaughtered in stupid battles planned by stupid generals. Those who survived were shocked, disillusioned and embittered by their war experiences, and saw that their real enemies were not the Germans, but the old men at home who had lied to them. They rejected the values of the society that had sent them to war, and in doing so separated their own generation from the past and from their cultural inheritance.[404]

This has become the most common perception of World War I, perpetuated by the art, cinema, poems, and stories published subsequently. Films such as All Quiet on the Western Front, Paths of Glory and King and Country have perpetuated the idea, while war-time films including Camrades, Poppies of Flanders, and Shoulder Arms indicate that the most contemporary views of the war were overall far more positive.[405] Likewise, the art of Paul Nash, John Nash, Christopher Nevinson, and Henry Tonks in Britain painted a negative view of the conflict in keeping with the growing perception, while popular war-time artists such as Muirhead Bone painted more serene and pleasant interpretations subsequently rejected as inaccurate.[404] Several historians like John Terraine, Niall Ferguson and Gary Sheffield have challenged these interpretations as partial and polemical views:

These beliefs did not become widely shared because they offered the only accurate interpretation of wartime events. In every respect, the war was much more complicated than they suggest. In recent years, historians have argued persuasively against almost every popular cliché of World War I. It has been pointed out that, although the losses were devastating, their greatest impact was socially and geographically limited. The many emotions other than horror experienced by soldiers in and out of the front line, including comradeship, boredom, and even enjoyment, have been recognised. The war is not now seen as a 'fight about nothing', but as a war of ideals, a struggle between aggressive militarism and more or less liberal democracy. It has been acknowledged that British generals were often capable men facing difficult challenges and that it was under their command that the British army played a major part in the defeat of the Germans in 1918: a great forgotten victory.[405]

Though these views have been discounted as "myths",[404][406] they are common. They have dynamically changed according to contemporary influences, reflecting in the 1950s perceptions of the war as "aimless" following the contrasting Second World War and emphasising conflict within the ranks during times of class conflict in the 1960s. The majority of additions to the contrary are often rejected.[405]

Writers such as Ernest Hemingway wrote many stories on the experiences of veterans after the war, such as the short story Soldier's Home, about young veteran Harold Krebs trying to integrate back into society.[407]

Social trauma

 
A 1919 book for veterans, from the US War Department

The social trauma caused by unprecedented rates of casualties manifested itself in different ways, which have been the subject of subsequent historical debate.[408] Over 8 million Europeans died in the war. Millions suffered permanent disabilities. The war gave birth to fascism and Bolshevism and destroyed the dynasties that had ruled the Ottoman, Habsburg, Russian and German Empires.[393]

The optimism of la belle époque was destroyed, and those who had fought in the war were referred to as the Lost Generation.[409] For years afterward, people mourned the dead, the missing, and the many disabled.[410] Many soldiers returned with severe trauma, suffering from shell shock (also called neurasthenia, a condition related to post-traumatic stress disorder).[411] Many more returned home with few after-effects; however, their silence about the war contributed to the conflict's growing mythological status. Though many participants did not share in the experiences of combat or spend any significant time at the front, or had positive memories of their service, the images of suffering and trauma became the widely shared perception. Such historians as Dan Todman, Paul Fussell, and Samuel Heyns have all published works since the 1990s arguing that these common perceptions of the war are factually incorrect.[408]

Discontent in Germany and Austria

The rise of Nazism and fascism included a revival of the nationalist spirit and a rejection of many post-war changes. Similarly, the popularity of the stab-in-the-back legend (German: Dolchstoßlegende) was a testament to the psychological state of defeated Germany and was a rejection of responsibility for the conflict. This conspiracy theory of the betrayal of the German war effort by Jews became common, and the German populace came to see themselves as victims. The widespread acceptance of the "stab-in-the-back" theory delegitimised the Weimar government and destabilised the system, opening it to extremes of right and left. The same occurred in Austria which did not consider itself responsible for the outbreak of the war and claimed not to have suffered a military defeat.[412]

Communist and fascist movements around Europe drew strength from this theory and enjoyed a new level of popularity. These feelings were most pronounced in areas directly or harshly affected by the war. Adolf Hitler was able to gain popularity by using German discontent with the still controversial Treaty of Versailles.[413] World War II was in part a continuation of the power struggle never fully resolved by World War I. Furthermore, it was common for Germans in the 1930s to justify acts of aggression due to perceived injustices imposed by the victors of World War I.[414][415][416] American historian William Rubinstein wrote that:

The 'Age of Totalitarianism' included nearly all the infamous examples of genocide in modern history, headed by the Jewish Holocaust, but also comprising the mass murders and purges of the Communist world, other mass killings carried out by Nazi Germany and its allies, and also the Armenian Genocide of 1915. All these slaughters, it is argued here, had a common origin, the collapse of the elite structure and normal modes of government of much of central, eastern and southern Europe as a result of World War I, without which surely neither Communism nor Fascism would have existed except in the minds of unknown agitators and crackpots.[417]

See also

Footnotes

  1. ^ Russian Empire during 1914–1917, Russian Republic during 1917. The Bolshevik government signed a separate peace with the Central Powers shortly after their armed seizure of power, resulting in a Central Powers victory on the Eastern Front of the war, and Russian defeat. However, this peace treaty was nullified by an Allied Powers victory on the Western Front, and the end of the war.
  2. ^ Following the Armistice of Focșani causing Romania to withdraw from the Eastern Front of World War I; Romania signed a peace treaty with the Central Powers on 7 May 1918, however the treaty was canceled by Romania and Romania itself rejoined the Allied Powers on 10 November 1918.
  3. ^ The United States did not ratify any of the treaties agreed to at the Paris Peace Conference.
  4. ^ Bulgaria joined the Central Powers on 14 October 1915.
  5. ^ The Ottoman Empire agreed to a secret alliance with Germany on 2 August 1914. It joined the war on the side of the Central Powers on 29 October 1914.
  6. ^ The United States declared war on Austria-Hungary on 7 December 1917.
  7. ^ Austria was considered one of the successor states to Austria-Hungary.
  8. ^ The United States declared war on Germany on 6 April 1917.
  9. ^ Hungary was considered one of the successor states to Austria-Hungary.
  10. ^ Although the Treaty of Sèvres was intended to end the war between the Allied Powers and the Ottoman Empire, the Allied Powers and the Republic of Turkey, the successor state of the Ottoman Empire, agreed to the Treaty of Lausanne.
  11. ^ Only the Triple Alliance was a formal "alliance"; the others listed were informal patterns of support.
  12. ^ Cvjetko Popović, Gavrilo Princip, Nedeljko Čabrinović, Trifko Grabež, and Vaso Čubrilović were Bosnian Serbs, while Muhamed Mehmedbašić was from the Bosniak Muslim community[32]
  13. ^ Bessarabia remained part of Romania until 1940, when it was annexed by Joseph Stalin as the Moldavian Soviet Socialist Republic;[156] following the dissolution of the USSR in 1991, it became the independent Republic of Moldova
  14. ^ Unlike the others, the successor state to the Russian Empire, the Union of Soviet Socialist Republics, retained similar external borders, via retaining or quickly recovering lost territories.
  15. ^ A German attempt to use chemical weapons on the Russian front in January 1915 failed to cause casualties.
  16. ^ 109 in this context – see Long and short scales
  17. ^ World War I officially ended when Germany paid off the final amount of reparations imposed on it by the Allies.[338][339][340][341]

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world, first, world, world, great, redirect, here, other, uses, first, world, disambiguation, world, disambiguation, great, disambiguation, disambiguation, this, article, multiple, issues, please, help, improve, discuss, these, issues, talk, page, learn, when,. The First World War World War One Great War and WWI redirect here For other uses see The First World War disambiguation World War One disambiguation Great War disambiguation and WWI disambiguation This article has multiple issues Please help improve it or discuss these issues on the talk page Learn how and when to remove these template messages This article may be too long to read and navigate comfortably Its current readable prose size is 116 kilobytes Please consider splitting content into sub articles condensing it or adding subheadings Please discuss this issue on the article s talk page June 2023 This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources World War I news newspapers books scholar JSTOR July 2023 Learn how and when to remove this template message Learn how and when to remove this template message World War IFrom the top left to right British Cheshire Regiment at the Battle of the Somme 1916 Ottoman Arab camel corps leaving for the Middle Eastern front 1916 SMS Grosser Kurfurst during Operation Albion 1917 German soldiers at the Battle of Verdun 1916 Aftermath of the siege of Przemysl in Austria Hungary 1914 1915 Bulgarian troops during the Monastir offensive 1916Date28 July 1914 11 November 1918 4 years 3 months and 2 weeks Peace treaties Treaty of VersaillesSigned 28 June 1919 c Treaty of Saint Germain en LayeSigned 10 September 1919Treaty of Neuilly sur SeineSigned 27 November 1919 d Treaty of TrianonSigned 4 June 1920Treaty of SevresSigned 10 August 1920 e United States Austria Peace TreatySigned 24 August 1921 f g United States Germany Peace TreatySigned 25 August 1921 h United States Hungary Peace TreatySigned 29 August 1921 i Treaty of LausanneSigned 24 July 1923 j LocationEurope Africa Middle East Pacific Atlantic Mediterranean and AdriaticResultAllied Powers victory See Aftermath of World War ITerritorialchangesFormation of new countries in Europe and the Middle East such as Yugoslavia Weimar Germany the Soviet Union Lithuania Estonia Latvia Austria Hungary Czechoslovakia Turkey Hejaz and YemenRestoration of Polish independence and establishment of the Second Polish RepublicTransfer of German colonies and territories to other countries partition of the Ottoman Empire dissolution of Austria HungaryBelligerentsAllied Powers France United Kingdom and its territories Canada Australia India Ceylon New Zealand Newfoundland South Africa Russia a Serbia Belgium Japan Montenegro Luxembourg Italy from 1915 Romania from 1916 b Portugal from 1916 Hejaz from 1916 United States from 1917 Greece from 1917 Siam from 1917 China from 1917 Brazil from 1917 Czechoslovakia from 1918 Armenia from 1918 and others Central Powers Germany Austria Hungary Ottoman Empire Bulgaria from 1915 and others Commanders and leadersMain Allied leaders Raymond Poincare G Clemenceau H H Asquith David Lloyd George Nicholas II Georgy Lvov Alexander Kerensky Peter I Crown Prince Alexander Nicholas I Antonio Salandra Paolo Boselli Vittorio Orlando Woodrow Wilson Yoshihito Eleftherios VenizelosMain Central leaders Wilhelm II Franz Joseph I Charles I Mehmed V Mehmed VI Ferdinand ICasualties and lossesMilitary dead Over 5 525 000 Civilian dead Over 4 000 000 Total dead Over 9 000 000 further detailsMilitary dead Over 4 386 000 Civilian dead Over 3 700 000 Total dead Over 8 000 000 further details World War I 28 July 1914 11 November 1918 often abbreviated as WWI was a global conflict fought between two coalitions the Allied Powers and the Central Powers Fighting took place throughout Europe the Middle East Africa the Pacific and parts of Asia The first decade of the 20th century saw increasing diplomatic tension between the European great powers This reached a breaking point on 28 June 1914 when a Bosnian Serb named Gavrilo Princip assassinated Archduke Franz Ferdinand heir to the Austro Hungarian throne Austria Hungary held Serbia responsible and declared war on 28 July Russia came to Serbia s defence and by 4 August Germany France and Britain were drawn into the war with the Ottoman Empire joining in November the same year German strategy in 1914 was to first defeat France then transfer forces to the Russian front However this failed and by the end of 1914 the Western Front consisted of a continuous line of trenches stretching from the English Channel to Switzerland The Eastern Front was more dynamic but neither side could gain a decisive advantage despite costly offensives As the war expanded to more fronts Bulgaria Romania Greece Italy and others joined in from 1915 onward In early 1917 the United States entered the war on the side of the Allies and later the same year the Bolsheviks seized power in the Russian October Revolution making peace with the Central Powers in early 1918 Germany launched an offensive in the west in March 1918 but despite initial success it left the German Army exhausted and demoralised A successful Allied counter offensive later that year caused a collapse of the German frontline By the end of 1918 Bulgaria the Ottoman Empire and Austria Hungary agreed to armistices with the Allies leaving Germany isolated Facing revolution at home and with his army on the verge of mutiny Kaiser Wilhelm II abdicated on 9 November An armistice three days later ended the fighting and the Paris Peace Conference imposed various settlements on the defeated powers notably the Treaty of Versailles World War I was one of the deadliest wars in history and resulted in an estimated 9 million soldiers dead and 23 million wounded while 5 million civilians died due to military action hunger and disease Millions more died as a result of genocide and the devastation of the war heavily contributed to the 1918 Spanish flu pandemic The dissolution of the Russian German Austro Hungarian and Ottoman Empires resulted in the creation of new independent states including Poland Finland Czechoslovakia and Yugoslavia The inability to manage post war instability contributed to the outbreak of World War II in September 1939 Contents 1 Names 2 Background 2 1 Political and military alliances 2 2 Arms race 2 3 Conflicts in the Balkans 3 Prelude 3 1 Sarajevo assassination 3 2 Expansion of violence in Bosnia and Herzegovina 3 3 July Crisis 4 Progress of the war 4 1 Opening hostilities 4 1 1 Confusion among the Central Powers 4 1 2 Serbian campaign 4 1 3 German offensive in Belgium and France 4 1 4 Asia and the Pacific 4 1 5 African campaigns 4 1 6 Indian support for the Allies 4 2 Western Front 1914 to 1916 4 2 1 Trench warfare begins 4 2 2 Continuation of trench warfare 4 3 Naval war 4 4 Southern theatres 4 4 1 War in the Balkans 4 4 2 Ottoman Empire 4 4 3 Italian Front 4 4 4 Romanian participation 4 5 Eastern Front 4 5 1 Initial actions 4 6 Central Powers peace overtures 4 7 Final years of the war 4 7 1 Russian Revolution and withdrawal 4 7 2 United States enters the war 4 7 3 Nivelle Offensive April May 1917 4 7 4 Sinai and Palestine campaign 1917 1918 4 7 5 German spring offensive March July 1918 4 7 6 Hundred Days Offensive August November 1918 4 7 6 1 Allied advance to the Hindenburg Line 4 7 7 Breakthrough of Macedonian Front September 1918 4 8 Armistices and capitulations 4 8 1 German Revolution 1918 1919 4 8 2 New German government surrenders 5 Aftermath 5 1 Formal end of the war 5 2 Peace treaties and national boundaries 5 3 National identities 6 Health effects 7 War crimes 7 1 Rape of Belgium 7 2 Austro Hungarian war crimes in Serbia 7 3 Baralong incidents 7 4 Torpedoing of HMHS Llandovery Castle 7 5 Blockade of Germany 7 6 Chemical weapons in warfare 7 7 Massacres of Albanians 7 8 Genocide and ethnic cleansing 7 8 1 Ottoman Empire 7 8 2 Russian Empire 8 Soldiers experiences 8 1 Prisoners of war 8 2 Military attaches and war correspondents 8 3 Conscription 8 3 1 Canada 8 3 2 Australia 8 3 3 Britain 8 3 4 United States 8 3 5 Austria Hungary 9 Economic effects 10 Support and opposition for the war 10 1 Support 10 1 1 Patriotic Funds 10 2 Opposition 11 Technology 11 1 Ground warfare 11 2 Naval 11 3 Aviation 11 4 Radio telecommunication 12 Diplomacy 13 Legacy and memory 13 1 Historiography 13 2 Memorials 13 3 Cultural memory 13 4 Social trauma 13 5 Discontent in Germany and Austria 14 See also 15 Footnotes 16 References 17 Bibliography 18 External links 18 1 Library guidesNamesThe term world war was first coined in September 1914 by German biologist and philosopher Ernst Haeckel He claimed that there is no doubt that the course and character of the feared European War will become the first world war in the full sense of the word 1 in The Indianapolis Star on 20 September 1914 The term First World War had been used by Lt Col Charles a Court Repington as a title for his memoirs published in 1920 he had noted his discussion on the matter with a Major Johnstone of Harvard University in his diary entry of 10 September 1918 2 3 Prior to World War II the events of 1914 1918 were generally known as the Great War or simply the World War 4 5 In August 1914 the magazine The Independent wrote This is the Great War It names itself 6 In October 1914 the Canadian magazine Maclean s similarly wrote Some wars name themselves This is the Great War 7 Contemporary Europeans also referred to it as the war to end war and it was also described as the war to end all wars due to their perception of its unparalleled scale devastation and loss of life 8 BackgroundMain article Causes of World War I Political and military alliances For much of the 19th century the major European powers maintained a tenuous balance of power among themselves known as the Concert of Europe 9 After 1848 this was challenged by a variety of factors including Britain s withdrawal into so called splendid isolation the decline of the Ottoman Empire New Imperialism and the rise of Prussia under Otto von Bismarck The 1866 Austro Prussian War established Prussian hegemony in Germany while victory in the 1870 1871 Franco Prussian War allowed Bismarck to consolidate the German states into a German Empire under Prussian leadership Avenging the defeat of 1871 or revanchism and recovering the provinces of Alsace Lorraine became the principal objects of French policy for the next forty years 10 nbsp Rival military coalitions in 1914 k Triple Entente Triple AllianceIn order to isolate France and avoid a war on two fronts Bismarck negotiated the League of the Three Emperors German Dreikaiserbund between Austria Hungary Russia and Germany After Russian victory in the 1877 1878 Russo Turkish War the League was dissolved due to Austrian concerns over Russian influence in the Balkans an area they considered of vital strategic interest Germany and Austria Hungary then formed the 1879 Dual Alliance which became the Triple Alliance when Italy joined in 1882 11 For Bismarck the purpose of these agreements was to isolate France by ensuring the three Empires resolved any disputes between themselves when this was threatened in 1880 by British and French attempts to negotiate directly with Russia he reformed the League in 1881 which was renewed in 1883 and 1885 After the agreement lapsed in 1887 he replaced it with the Reinsurance Treaty a secret agreement between Germany and Russia to remain neutral if either were attacked by France or Austria Hungary 12 Bismarck viewed peace with Russia as the foundation of German foreign policy but after becoming Kaiser in 1890 Wilhelm II forced him to retire and was persuaded not to renew the Reinsurance Treaty by his new Chancellor Leo von Caprivi 13 This provided France an opportunity to counteract the Triple Alliance by signing the Franco Russian Alliance in 1894 followed by the 1904 Entente Cordiale with Britain The Triple Entente was completed by the 1907 Anglo Russian Convention While these were not formal alliances by settling long standing colonial disputes in Africa and Asia the notion of British entry into any future conflict involving France or Russia became a possibility 14 British and Russian support for France against Germany during the Agadir Crisis in 1911 reinforced their relationship and increased Anglo German estrangement deepening the divisions that would erupt in 1914 15 Arms race German industrial strength and production significantly increased after 1871 driven by the creation of a unified Reich French indemnity payments and the annexation of Alsace Lorraine Backed by Wilhelm II Admiral Alfred von Tirpitz sought to use this growth in economic power to build a Kaiserliche Marine or Imperial German Navy which could compete with the British Royal Navy for world naval supremacy 16 His thinking was influenced by US naval strategist Alfred Thayer Mahan who argued possession of a blue water navy was vital for global power projection Tirpitz had his books translated into German while Wilhelm made them required reading for his advisors and senior military personnel 17 However it was also an emotional decision driven by Wilhelm s simultaneous admiration for the Royal Navy and desire to outdo and surpass it Bismarck thought that the British would not interfere in Europe so long as its maritime supremacy remained secure but his dismissal in 1890 led to a change in policy and an Anglo German naval arms race began 18 Despite the vast sums spent by Tirpitz the launch of HMS Dreadnought in 1906 gave the British a technological advantage over their German rivals which they never lost 16 Ultimately the race diverted huge resources into creating a German navy large enough to antagonise Britain but not defeat it in 1911 Chancellor Theobald von Bethmann Hollweg acknowledged defeat leading to the Rustungswende or armaments turning point when he switched expenditure from the navy to the army 19 nbsp SMS Rheinland a Nassau class battleship Germany s first response to the British DreadnoughtThis decision was not driven by a reduction in political tensions but German concern over Russia s quick recovery from its defeat in the Russo Japanese War and subsequent 1905 Russian Revolution that same year Economic reforms backed by funding from the French led to a significant post 1908 expansion of railways and transportation infrastructure particularly in its western border regions 20 Since Germany and Austria Hungary relied on faster mobilisation to compensate for their numerical inferiority compared to Russia the threat posed by the closing of this gap was more important than competing with the Royal Navy After Germany expanded its standing army by 170 000 troops in 1913 France extended compulsory military service from two to three years similar measures were taken by the Balkan powers and Italy which led to increased expenditure by the Ottomans and Austria Hungary Absolute figures are hard to calculate due to differences in categorising expenditure since they often omit civilian infrastructure projects like railways which also had logistical importance and military use It is known however that from 1908 to 1913 military spending by the six major European powers increased by over 50 in real terms 21 Conflicts in the Balkans nbsp Sarajevo citizens reading a poster with the proclamation of the Austrian annexation in 1908The years before 1914 were marked by a series of crises in the Balkans as other powers sought to benefit from Ottoman decline While Pan Slavic and Orthodox Russia considered itself the protector of Serbia and other Slav states they preferred the strategically vital Bosporus straits to be controlled by a weak Ottoman government rather than an ambitious Slav power like Bulgaria Since Russia had its own ambitions in northeastern Anatolia and their clients had over lapping claims in the Balkans balancing these divided Russian policy makers and added to regional instability 22 Austrian statesmen viewed the Balkans as essential for the continued existence of their Empire and saw Serbian expansion as a direct threat The 1908 1909 Bosnian Crisis began when Austria annexed the former Ottoman territory of Bosnia and Herzegovina which it had occupied since 1878 Timed to coincide with the Bulgarian Declaration of Independence from the Ottoman Empire this unilateral action was denounced by the European powers but accepted as there was no consensus on how to resolve the situation Some historians see this as a significant escalation ending any chance of Austria co operating with Russia in the Balkans while also damaging diplomatic relations between Serbia and Italy both of whom had their own expansionist ambitions in the region 23 Tensions increased after the 1911 1912 Italo Turkish War demonstrated Ottoman weakness and led to the formation of the Balkan League an alliance of Serbia Bulgaria Montenegro and Greece 24 The League quickly overran most of the Ottomans territory in the Balkans during the 1912 1913 First Balkan War much to the surprise of outside observers 25 The Serbian capture of ports on the Adriatic resulted in partial Austrian mobilisation starting on 21 November 1912 including units along the Russian border in Galicia In a meeting the next day the Russian government decided not to mobilise in response unwilling to precipitate a war for which they were not as of yet prepared to handle 26 The Great Powers sought to re assert control through the 1913 Treaty of London which created an independent Albania while enlarging the territories of Bulgaria Serbia Montenegro and Greece However disputes between the victors sparked the 33 day Second Balkan War when Bulgaria attacked Serbia and Greece on 16 June 1913 it was defeated losing most of Macedonia to Serbia and Greece and Southern Dobruja to Romania 27 The result was that even countries which benefited from the Balkan Wars such as Serbia and Greece felt cheated of their rightful gains while for Austria it demonstrated the apparent indifference with which other powers viewed their concerns including Germany 28 This complex mix of resentment nationalism and insecurity helps explain why the pre 1914 Balkans became known as the powder keg of Europe 29 PreludeFor a chronological guide see Timeline of World War I Sarajevo assassination Main article Assassination of Archduke Franz Ferdinand nbsp Traditionally thought to show the arrest of Gavrilo Princip right this photo is now believed by historians to depict an innocent bystander Ferdinand Behr 30 31 On 28 June 1914 Archduke Franz Ferdinand of Austria heir presumptive to Emperor Franz Joseph visited Sarajevo capital of the recently annexed provinces of Bosnia and Herzegovina Six assassins l from the movement known as Young Bosnia or Mlada Bosna took up positions along the route taken by the Archduke s motorcade with the intention of assassinating him Supplied with arms by extremists within the Serbian Black Hand intelligence organisation they hoped his death would free Bosnia from Austrian rule although there was little agreement on what would replace it 33 Nedeljko Cabrinovic threw a grenade at the Archduke s car and injured two of his aides who were taken to hospital while the convoy carried on The other assassins were also unsuccessful but an hour later as Ferdinand was returning from visiting the injured officers his car took a wrong turn into a street where Gavrilo Princip was standing He stepped forward and fired two pistol shots fatally wounding Ferdinand and his wife Sophie who both died shortly thereafter 34 Although Emperor Franz Joseph was shocked by the incident political and personal differences meant the two men were not close allegedly his first reported comment was A higher power has re established the order which I alas could not preserve 35 According to historian Zbynek Zeman his reaction was reflected more broadly in Vienna where the event almost failed to make any impression whatsoever On 28 and 29 June the crowds listened to music and drank wine as if nothing had happened 36 37 Nevertheless the impact of the murder of the heir to the throne was significant and has been described by historian Christopher Clark as a 9 11 effect a terrorist event charged with historic meaning transforming the political chemistry in Vienna 38 Expansion of violence in Bosnia and Herzegovina nbsp Crowds on the streets in the aftermath of the anti Serb riots in Sarajevo 29 June 1914The Austro Hungarian authorities encouraged the subsequent anti Serb riots in Sarajevo in which Bosnian Croats and Bosniaks killed two Bosnian Serbs and damaged numerous Serb owned buildings 39 40 Violent actions against ethnic Serbs were also organised outside Sarajevo in other cities in Austro Hungarian controlled Bosnia and Herzegovina Croatia and Slovenia Austro Hungarian authorities in Bosnia and Herzegovina imprisoned and extradited approximately 5 500 prominent Serbs 700 to 2 200 of whom died in prison A further 460 Serbs were sentenced to death A predominantly Bosniak special militia known as the Schutzkorps was established and carried out the persecution of Serbs 41 42 43 44 July Crisis Main articles July Crisis German entry into World War I Austro Hungarian entry into World War I and Russian entry into World War I The assassination initiated the July Crisis a month of diplomatic manoeuvring between Austria Hungary Germany Russia France and Britain Believing Serbian intelligence helped organise Franz Ferdinand s murder Austrian officials wanted to use the opportunity to end their interference in Bosnia and saw war as the best way of achieving this 45 However the Foreign Ministry had no solid proof of Serbian involvement and a dossier used to make its case was riddled with errors 46 On 23 July Austria delivered an ultimatum to Serbia listing ten demands made intentionally unacceptable to provide an excuse for starting hostilities 47 nbsp Ethno linguistic map of Austria Hungary 1910 Bosnia Herzegovina was annexed in 1908 Serbia ordered general mobilisation on 25 July but accepted all the terms except for those empowering Austrian representatives to suppress subversive elements inside Serbia and take part in the investigation and trial of Serbians linked to the assassination 48 49 Claiming this amounted to rejection Austria broke off diplomatic relations and ordered partial mobilisation the next day on 28 July they declared war on Serbia and began shelling Belgrade Having initiated war preparations on 25 July Russia now ordered general mobilisation in support of Serbia on 30th 50 Anxious to ensure backing from the SPD political opposition by presenting Russia as the aggressor German Chancellor Bethmann Hollweg delayed commencement of war preparations until 31 July 51 That afternoon the Russian government were handed a note requiring them to cease all war measures against Germany and Austria Hungary within 12 hours 52 A further German demand for neutrality was refused by the French who ordered general mobilisation but delayed declaring war 53 The German General Staff had long assumed they faced a war on two fronts the Schlieffen Plan envisaged using 80 of the army to defeat France in the west then switch to Russia Since this required them to move quickly mobilisation orders were issued that afternoon 54 nbsp Cheering crowds in London and Paris on the day war was declared At a meeting on 29 July the British cabinet had narrowly decided its obligations to Belgium under the 1839 Treaty of London did not require it to oppose a German invasion with military force However this was largely driven by Prime Minister Asquith s desire to maintain unity he and his senior Cabinet ministers were already committed to support France the Royal Navy had been mobilised and public opinion was strongly in favour of intervention 55 On 31 July Britain sent notes to Germany and France asking them to respect Belgian neutrality France pledged to do so Germany did not reply 56 Once the German ultimatum to Russia expired on the morning of 1 August the two countries were at war Later the same day Wilhelm was informed by his ambassador in London Prince Lichnowsky that Britain would remain neutral if France was not attacked and might not intervene at all given the ongoing Home Rule Crisis in Ireland 57 Jubilant at this news he ordered General Moltke the German chief of staff to march the whole of the army to the East This allegedly brought Moltke to the verge of a nervous breakdown who protested that it cannot be done The deployment of millions cannot be improvised 58 Lichnowsky soon realised he was mistaken although Wilhelm insisted on waiting for a telegram from his cousin George V once received it confirmed there had been a misunderstanding and he told Moltke Now do what you want 59 Aware of German plans to attack through Belgium French Commander in Chief Joseph Joffre asked his government for permission to cross the border and pre empt such a move To avoid a violation of Belgian neutrality he was told any advance could come only after a German invasion 60 On 2 August Germany occupied Luxembourg and exchanged fire with French units on 3 August they declared war on France and demanded free passage across Belgium which was refused Early on the morning of 4 August the Germans invaded and Albert I of Belgium called for assistance under the Treaty of London 61 62 Britain sent Germany an ultimatum demanding they withdraw from Belgium when this expired at midnight without a response the two empires were at war 63 Progress of the warFurther information Diplomatic history of World War I Opening hostilities Confusion among the Central Powers The strategy of the Central Powers suffered from miscommunication Germany had promised to support Austria Hungary s invasion of Serbia but interpretations of what this meant differed Previously tested deployment plans had been replaced early in 1914 but those had never been tested in exercises Austro Hungarian leaders believed Germany would cover its northern flank against Russia 64 Germany however envisioned Austria Hungary directing most of its troops against Russia while Germany dealt with France This confusion forced the Austro Hungarian Army to divide its forces between the Russian and Serbian fronts citation needed Serbian campaign Main article Serbian campaign nbsp Serbian Army Bleriot XI Oluj 1915Beginning on 12 August the Austrian and Serbs clashed at the battles of the Cer and Kolubara over the next two weeks Austrian attacks were repulsed with heavy losses dashing their hopes of a swift victory and marking the first major Allied victories of the war As a result Austria had to keep sizeable forces on the Serbian front weakening its efforts against Russia 65 Serbia s defeat of the 1914 invasion has been called one of the major upset victories of the twentieth century 66 In spring 1915 the campaign saw the first use of anti aircraft warfare after an Austrian plane was shot down with ground to air fire as well as the first medical evacuation by the Serbian army in autumn 1915 67 68 German offensive in Belgium and France Main article Great Retreat nbsp German soldiers on the way to the front in 1914 at this stage all sides expected the conflict to be a short one Upon mobilisation in 1914 80 of the German Army was located on the Western Front with the remainder acting as a screening force in the East officially titled Aufmarsch II West it is better known as the Schlieffen Plan after its creator Alfred von Schlieffen head of the German General Staff from 1891 to 1906 Rather than a direct attack across their shared frontier the German right wing would sweep through the Netherlands and Belgium then swing south encircling Paris and trapping the French army against the Swiss border Schlieffen estimated this would take six weeks after which the German army would transfer to the East and defeat the Russians 69 The plan was substantially modified by his successor Helmuth von Moltke the Younger Under Schlieffen 85 of German forces in the west were assigned to the right wing with the remainder holding along the frontier By keeping his left wing deliberately weak he hoped to lure the French into an offensive into the lost provinces of Alsace Lorraine which was in fact the strategy envisaged by their Plan XVII 69 However Moltke grew concerned the French might push too hard on his left flank and as the German Army increased in size from 1908 to 1914 he changed the allocation of forces between the two wings from 85 15 to 70 30 70 He also considered Dutch neutrality essential for German trade and cancelled the incursion into the Netherlands which meant any delays in Belgium threatened the entire viability of the plan 71 Historian Richard Holmes argues these changes meant the right wing was not strong enough to achieve decisive success and thus led to unrealistic goals and timings 72 nbsp French bayonet charge during the Battle of the Frontiers by the end of August French casualties exceeded 260 000 including 75 000 dead The initial German advance in the West was very successful and by the end of August the Allied left which included the British Expeditionary Force BEF was in full retreat At the same time the French offensive in Alsace Lorraine was a disastrous failure with casualties exceeding 260 000 including 27 000 killed on 22 August during the Battle of the Frontiers 73 German planning provided broad strategic instructions while allowing army commanders considerable freedom in carrying them out at the front this worked well in 1866 and 1870 but in 1914 von Kluck used this freedom to disobey orders opening a gap between the German armies as they closed on Paris 74 The French and British exploited this gap to halt the German advance east of Paris at the First Battle of the Marne from 5 to 12 September and push the German forces back some 50 km 31 mi citation needed In 1911 the Russian Stavka had agreed with the French to attack Germany within fifteen days of mobilisation ten days before the Germans had anticipated although it meant the two Russian armies that entered East Prussia on 17 August did so without many of their support elements 75 By the end of 1914 German troops held strong defensive positions inside France controlled the bulk of France s domestic coalfields and had inflicted 230 000 more casualties than it lost itself However communications problems and questionable command decisions cost Germany the chance of a decisive outcome while it had failed to achieve the primary objective of avoiding a long two front war 76 As was apparent to a number of German leaders this amounted to a strategic defeat shortly after the Marne Crown Prince Wilhelm told an American reporter We have lost the war It will go on for a long time but lost it is already 77 Asia and the Pacific Main article Asian and Pacific theatre of World War I nbsp World empires and colonies around 1914On 30 August 1914 New Zealand occupied German Samoa now the independent state of Samoa On 11 September the Australian Naval and Military Expeditionary Force landed on the island of New Britain then part of German New Guinea On 28 October the German cruiser SMS Emden sank the Russian cruiser Zhemchug in the Battle of Penang Japan declared war on Germany prior to seizing territories in the Pacific which later became the South Seas Mandate as well as German Treaty ports on the Chinese Shandong peninsula at Tsingtao After Vienna refused to withdraw its cruiser SMS Kaiserin Elisabeth from Tsingtao Japan declared war on Austria Hungary as well and the ship was sunk at Tsingtao in November 1914 78 Within a few months Allied forces had seized all German territories in the Pacific leaving only isolated commerce raiders and a few holdouts in New Guinea 79 80 African campaigns Main article African theatre of World War I Some of the first clashes of the war involved British French and German colonial forces in Africa On 6 7 August French and British troops invaded the German protectorate of Togoland and Kamerun On 10 August German forces in South West Africa attacked South Africa sporadic and fierce fighting continued for the rest of the war The German colonial forces in German East Africa led by Colonel Paul von Lettow Vorbeck fought a guerrilla warfare campaign during World War I and only surrendered two weeks after the armistice took effect in Europe 81 Indian support for the Allies Main article Indian Army during World War I Further information Hindu German Conspiracy Niedermayer Hentig Expedition and Third Anglo Afghan War nbsp British Indian Army infantry divisions in France these troops were withdrawn in December 1915 and served in the Mesopotamian campaign Prior to the war Germany had attempted to use Indian nationalism and pan Islamism to its advantage a policy continued post 1914 by instigating uprisings in India while the Niedermayer Hentig Expedition urged Afghanistan to join the war on the side of Central Powers However contrary to British fears of a revolt in India the outbreak of the war saw a reduction in nationalist activity 82 83 This was largely because leaders from the Indian National Congress and other groups believed support for the British war effort would hasten Indian Home Rule a promise allegedly made explicit in 1917 by Edwin Montagu then Secretary of State for India 84 In 1914 the British Indian Army was larger than the British Army itself and between 1914 and 1918 an estimated 1 3 million Indian soldiers and labourers served in Europe Africa and the Middle East while the Government of India and their princely allies supplied large quantities of food money and ammunition In all 140 000 soldiers served on the Western Front and nearly 700 000 in the Middle East with 47 746 killed and 65 126 wounded 85 The suffering engendered by the war as well as the failure of the British government to grant self government to India after the end of hostilities bred disillusionment and resulted in the campaign for full independence led by Mahatma Gandhi 86 Western Front 1914 to 1916 Main article Western Front World War I Trench warfare begins nbsp British Indian soldiers digging trenches in Laventie France 1915Pre war military tactics that emphasised open warfare and the individual rifleman proved obsolete when confronted with conditions prevailing in 1914 Technological advances allowed the creation of strong defensive systems largely impervious to massed infantry advances such as barbed wire machine guns and above all far more powerful artillery which dominated the battlefield and made crossing open ground extremely difficult 87 Both sides struggled to develop tactics for breaching entrenched positions without suffering heavy casualties In time however technology enabled the production of new offensive weapons such as gas warfare and the tank 88 After the First Battle of the Marne in September 1914 Allied and German forces unsuccessfully tried to outflank each other a series of manoeuvres later known as the Race to the Sea By the end of 1914 the opposing forces confronted each other along an uninterrupted line of entrenched positions from the Channel to the Swiss border 89 Since the Germans were normally able to choose where to stand they generally held the high ground while their trenches tended to be better built those constructed by the French and English were initially considered temporary only needed until an offensive would smash the German defences 90 Both sides tried to break the stalemate using scientific and technological advances On 22 April 1915 at the Second Battle of Ypres the Germans violating the Hague Convention used chlorine gas for the first time on the Western Front Several types of gas soon became widely used by both sides and though it never proved a decisive battle winning weapon it became one of the most feared and best remembered horrors of the war 91 92 Continuation of trench warfare Neither side proved able to deliver a decisive blow for the next two years Throughout 1915 17 the British Empire and France suffered more casualties than Germany because of both the strategic and tactical stances chosen by the sides Strategically while the Germans mounted only one major offensive the Allies made several attempts to break through the German lines citation needed nbsp German casualties at the Somme 1916In February 1916 the Germans attacked French defensive positions at the Battle of Verdun lasting until December 1916 The Germans made initial gains before French counter attacks returned matters to near their starting point Casualties were greater for the French but the Germans bled heavily as well with anywhere from 700 000 93 to 975 000 94 casualties suffered between the two combatants Verdun became a symbol of French determination and self sacrifice 95 The Battle of the Somme was an Anglo French offensive of July to November 1916 The opening day on 1 July 1916 was the bloodiest single day in the history of the British Army which suffered 57 470 casualties including 19 240 dead As a whole the Somme offensive led to an estimated 420 000 British casualties along with 200 000 French and 500 000 German 96 Gun fire was not the only factor taking lives the diseases that emerged in the trenches were a major killer on both sides The living conditions made it so that countless diseases and infections occurred such as trench foot shell shock blindness burns from mustard gas lice trench fever cooties body lice and the Spanish flu 97 unreliable source Naval war Main article Naval warfare of World War I nbsp Battleships of the Hochseeflotte 1917At the start of the war German cruisers were scattered across the globe some of which were subsequently used to attack Allied merchant shipping The British Royal Navy systematically hunted them down though not without some embarrassment from its inability to protect Allied shipping For example the light cruiser SMS Emden which was part of the German East Asia Squadron stationed at Qingdao seized or sank 15 merchantmen as well as a Russian cruiser and a French destroyer Most of the squadron was returning to Germany when it sank two British armoured cruisers at the Battle of Coronel in November 1914 before being virtually destroyed at the Battle of the Falkland Islands in December The SMS Dresden escaped with a few auxiliaries but after the Battle of Mas a Tierra these too had either been destroyed or interned 98 Soon after the outbreak of hostilities Britain began a naval blockade of Germany The strategy proved effective cutting off vital military and civilian supplies although this blockade violated accepted international law codified by several international agreements of the past two centuries 99 Britain mined international waters to prevent any ships from entering entire sections of ocean causing danger to even neutral ships 100 Since there was limited response to this tactic of the British Germany expected a similar response to its unrestricted submarine warfare 101 The Battle of Jutland German Skagerrakschlacht or Battle of the Skagerrak in May June 1916 developed into the largest naval battle of the war It was the only full scale clash of battleships during the war and one of the largest in history The Kaiserliche Marine s High Seas Fleet commanded by Vice Admiral Reinhard Scheer fought the Royal Navy s Grand Fleet led by Admiral Sir John Jellicoe The engagement was a stand off as the Germans were outmanoeuvred by the larger British fleet but managed to escape and inflicted more damage to the British fleet than they received Strategically however the British asserted their control of the sea and the bulk of the German surface fleet remained confined to port for the duration of the war 102 nbsp U 155 exhibited near Tower Bridge in London after the 1918 ArmisticeGerman U boats attempted to cut the supply lines between North America and Britain 103 The nature of submarine warfare meant that attacks often came without warning giving the crews of the merchant ships little hope of survival 103 104 The United States launched a protest and Germany changed its rules of engagement After the sinking of the passenger ship RMS Lusitania in 1915 Germany promised not to target passenger liners while Britain armed its merchant ships placing them beyond the protection of the cruiser rules which demanded warning and movement of crews to a place of safety a standard that lifeboats did not meet 105 Finally in early 1917 Germany adopted a policy of unrestricted submarine warfare realising the Americans would eventually enter the war 103 106 Germany sought to strangle Allied sea lanes before the United States could transport a large army overseas but after initial successes eventually failed to do so 103 The U boat threat lessened in 1917 when merchant ships began travelling in convoys escorted by destroyers This tactic made it difficult for U boats to find targets which significantly lessened losses after the hydrophone and depth charges were introduced accompanying destroyers could attack a submerged submarine with some hope of success Convoys slowed the flow of supplies since ships had to wait as convoys were assembled The solution to the delays was an extensive program of building new freighters Troopships were too fast for the submarines and did not travel the North Atlantic in convoys 107 The U boats had sunk more than 5 000 Allied ships at a cost of 199 submarines 108 World War I also saw the first use of aircraft carriers in combat with HMS Furious launching Sopwith Camels in a successful raid against the Zeppelin hangars at Tondern in July 1918 as well as blimps for antisubmarine patrol 109 Southern theatres War in the Balkans Main articles Balkans theatre Bulgaria during World War I Serbian campaign and Macedonian front nbsp Refugee transport from Serbia in Leibnitz Styria 1914 nbsp Bulgarian soldiers in a trench preparing to fire against an incoming aeroplane nbsp Austro Hungarian troops executing captured Serbians 1917 Serbia lost about 850 000 people during the war a quarter of its pre war population 110 Faced with Russia in the east Austria Hungary could spare only one third of its army to attack Serbia After suffering heavy losses the Austrians briefly occupied the Serbian capital Belgrade A Serbian counter attack in the Battle of Kolubara succeeded in driving them from the country by the end of 1914 For the first ten months of 1915 Austria Hungary used most of its military reserves to fight Italy German and Austro Hungarian diplomats however scored a coup by persuading Bulgaria to join the attack on Serbia 111 The Austro Hungarian provinces of Slovenia Croatia and Bosnia provided troops for Austria Hungary in the fight with Serbia Russia and Italy Montenegro allied itself with Serbia 112 Bulgaria declared war on Serbia on 14 October 1915 and joined in the attack by the Austro Hungarian army under Mackensen s army of 250 000 that was already underway Serbia was conquered in a little more than a month as the Central Powers now including Bulgaria sent in 600 000 troops total The Serbian army fighting on two fronts and facing certain defeat retreated into northern Albania The Serbs suffered defeat in the Battle of Kosovo Montenegro covered the Serbian retreat towards the Adriatic coast in the Battle of Mojkovac in 6 7 January 1916 but ultimately the Austrians also conquered Montenegro The surviving Serbian soldiers were evacuated by ship to Greece 113 After conquest Serbia was divided between Austro Hungary and Bulgaria 114 In late 1915 a Franco British force landed at Salonica in Greece to offer assistance and to pressure its government to declare war against the Central Powers However the pro German King Constantine I dismissed the pro Allied government of Eleftherios Venizelos before the Allied expeditionary force arrived 115 The friction between the King of Greece and the Allies continued to accumulate with the National Schism which effectively divided Greece between regions still loyal to the king and the new provisional government of Venizelos in Salonica After intense negotiations and an armed confrontation in Athens between Allied and royalist forces an incident known as Noemvriana the King of Greece abdicated and his second son Alexander took his place Greece officially joined the war on the side of the Allies in June 1917 citation needed The Macedonian front was initially mostly static French and Serbian forces retook limited areas of Macedonia by recapturing Bitola on 19 November 1916 following the costly Monastir offensive which brought stabilisation of the front 116 Serbian and French troops finally made a breakthrough in September 1918 in the Vardar offensive after most of the German and Austro Hungarian troops had been withdrawn The Bulgarians were defeated at the Battle of Dobro Pole and by 25 September British and French troops had crossed the border into Bulgaria proper as the Bulgarian army collapsed Bulgaria capitulated four days later on 29 September 1918 117 The German high command responded by despatching troops to hold the line but these forces were far too weak to re establish a front 118 The disappearance of the Macedonian front meant that the road to Budapest and Vienna was now opened to Allied forces Hindenburg and Ludendorff concluded that the strategic and operational balance had now shifted decidedly against the Central Powers and a day after the Bulgarian collapse insisted on an immediate peace settlement 119 Ottoman Empire Main article Ottoman Empire in World War I See also Middle Eastern theatre of World War I nbsp Australian troops charging near a Turkish trench during the Gallipoli Campaign nbsp Mehmed V greeting Wilhelm II on his arrival at ConstantinopleThe Ottomans threatened Russia s Caucasian territories and Britain s communications with India via the Suez Canal As the conflict progressed the Ottoman Empire took advantage of the European powers preoccupation with the war and conducted large scale ethnic cleansing of the indigenous Armenian Greek and Assyrian Christian populations known as the Armenian genocide Greek genocide and Sayfo respectively 120 121 122 The British and French opened overseas fronts with the Gallipoli 1915 and Mesopotamian campaigns 1914 In Gallipoli the Ottoman Empire successfully repelled the British French and Australian and New Zealand Army Corps ANZACs In Mesopotamia by contrast after the defeat of the British defenders in the siege of Kut by the Ottomans 1915 16 British Imperial forces reorganised and captured Baghdad in March 1917 The British were aided in Mesopotamia by local Arab and Assyrian fighters while the Ottomans employed local Kurdish and Turcoman tribes 123 nbsp Italian Bersaglieri with a machine gun instructor in PalestineFurther to the west the Suez Canal was defended from Ottoman attacks in 1915 and 1916 in August a German and Ottoman force was defeated at the Battle of Romani by the ANZAC Mounted Division and the 52nd Lowland Infantry Division Following this victory an Egyptian Expeditionary Force advanced across the Sinai Peninsula pushing Ottoman forces back in the Battle of Magdhaba in December and the Battle of Rafa on the border between the Egyptian Sinai and Ottoman Palestine in January 1917 124 Russian armies generally had success in the Caucasus campaign Enver Pasha supreme commander of the Ottoman armed forces was ambitious and dreamed of re conquering central Asia and areas that had been lost to Russia previously He was however a poor commander 125 He launched an offensive against the Russians in the Caucasus in December 1914 with 100 000 troops insisting on a frontal attack against mountainous Russian positions in winter He lost 86 of his force at the Battle of Sarikamish 126 nbsp Kaiser Wilhelm II inspecting Turkish troops of the 15th Corps in East Galicia Austria Hungary now Poland Prince Leopold of Bavaria the Supreme Commander of the German Army on the Eastern Front is second from the left The Ottoman Empire with German support invaded Persia modern Iran in December 1914 in an effort to cut off British and Russian access to petroleum reservoirs around Baku near the Caspian Sea 127 Persia ostensibly neutral had long been under the spheres of British and Russian influence The Ottomans and Germans were aided by Kurdish and Azeri forces together with a large number of major Iranian tribes such as the Qashqai Tangistanis Lurs and Khamseh while the Russians and British had the support of Armenian and Assyrian forces The Persian campaign was to last until 1918 and end in failure for the Ottomans and their allies However the Russian withdrawal from the war in 1917 led to Armenian and Assyrian forces who had hitherto inflicted a series of defeats upon the forces of the Ottomans and their allies being cut off from supply lines outnumbered outgunned and isolated forcing them to fight and flee towards British lines in northern Mesopotamia 128 nbsp Russian forest trench at the Battle of Sarikamish 1914 1915General Yudenich the Russian commander from 1915 to 1916 drove the Turks out of most of the southern Caucasus with a string of victories 126 During the 1916 campaign the Russians defeated the Turks in the Erzurum offensive also occupying Trabzon In 1917 Russian Grand Duke Nicholas assumed command of the Caucasus front Nicholas planned a railway from Russian Georgia to the conquered territories so that fresh supplies could be brought up for a new offensive in 1917 However in March 1917 February in the pre revolutionary Russian calendar the Tsar abdicated in the course of the February Revolution and the Russian Caucasus Army began to fall apart citation needed The Arab Revolt instigated by the Arab bureau of the British Foreign Office started June 1916 with the Battle of Mecca led by Sharif Hussein of Mecca and ended with the Ottoman surrender of Damascus Fakhri Pasha the Ottoman commander of Medina resisted for more than two and half years during the siege of Medina before surrendering in January 1919 129 The Senussi tribe along the border of Italian Libya and British Egypt incited and armed by the Turks waged a small scale guerrilla war against Allied troops The British were forced to dispatch 12 000 troops to oppose them in the Senussi campaign Their rebellion was finally crushed in mid 1916 130 Total Allied casualties on the Ottoman fronts amounted 650 000 men Total Ottoman casualties were 725 000 with 325 000 dead and 400 000 wounded 131 Italian Front Main articles Italian front World War I White War and Military history of Italy during World War I nbsp Isonzo Offensives 1915 1917Although Italy joined the Triple Alliance in 1882 a treaty with its traditional Austrian enemy was so controversial that subsequent governments denied its existence and the terms were only made public in 1915 132 This arose from nationalist designs on Austro Hungarian territory in Trentino the Austrian Littoral Rijeka and Dalmatia which were considered vital to secure the borders established in 1866 133 In 1902 Rome secretly agreed with France to remain neutral if the latter was attacked by Germany effectively nullifying its role in the Triple Alliance 134 nbsp Italian soldiers in trench 1918 nbsp Austro Hungarian trench at 3 850 metres in the Ortler Alps one of the most challenging fronts of the warWhen the war began in 1914 Italy argued the Triple Alliance was defensive in nature and it was not obliged to support an Austrian attack on Serbia Opposition to joining the Central Powers increased when Turkey became a member in September since in 1911 Italy had occupied Ottoman possessions in Libya and the Dodecanese islands 135 To secure Italian neutrality the Central Powers offered them the French protectorate of Tunisia while in return for an immediate entry into the war the Allies agreed to their demands for Austrian territory and sovereignty over the Dodecanese 136 Although they remained secret these provisions were incorporated into the April 1915 Treaty of London Italy joined the Triple Entente and on 23 May declared war on Austria Hungary 137 followed by Germany fifteen months later The pre 1914 Italian army was the weakest in Europe short of officers trained men adequate transport and modern weapons by April 1915 some of these deficiencies had been remedied but it was still unprepared for the major offensive required by the Treaty of London 138 The advantage of superior numbers was offset by the difficult terrain much of the fighting took place at altitudes of over 3000 metres in the Alps and Dolomites where trench lines had to be cut through rock and ice and keeping troops supplied was a major challenge These issues were exacerbated by unimaginative strategies and tactics 139 Between 1915 and 1917 the Italian commander Luigi Cadorna undertook a series of frontal assaults along the Isonzo which made little progress and cost many lives by the end of the war total Italian combat deaths totalled around 548 000 140 In the spring of 1916 the Austro Hungarians counterattacked in Asiago in the Strafexpedition but made little progress and were pushed by the Italians back to the Tyrol 141 Although an Italian corps occupied southern Albania in May 1916 their main focus was the Isonzo front which after the capture of Gorizia in August 1916 remained static until October 1917 After a combined Austro German force won a major victory at Caporetto Cadorna was replaced by Armando Diaz who retreated more than 100 kilometres 62 mi before holding positions along the Piave River 142 A second Austrian offensive was repulsed in June 1918 and by October it was clear the Central Powers had lost the war On 24 October Diaz launched the Battle of Vittorio Veneto and initially met stubborn resistance 143 but with Austria Hungary collapsing Hungarian divisions in Italy now demanded they be sent home 144 When this was granted many others followed and the Imperial army disintegrated the Italians taking over 300 000 prisoners 145 On 3 November the Armistice of Villa Giusti ended hostilities between Austria Hungary and Italy which occupied Trieste and areas along the Adriatic Sea awarded to it in 1915 146 Romanian participation Main article Romania in World War I nbsp nbsp Bucharest nbsp Timișoara Banat nbsp Cluj Transylvania nbsp Chișinău Moldova nbsp Constanța Dobruja nbsp Bulgaria nbsp Hungary nbsp Mărășești nbsp Oituzclass notpageimage Romania key locations 1916 1918 note using 2022 borders Despite secretly agreeing to support the Triple Alliance in 1883 Romania increasingly found itself at odds with the Central Powers over their support for Bulgaria in the 1912 to 1913 Balkan Wars and the status of ethnic Romanian communities in Hungarian controlled Transylvania 147 which comprised an estimated 2 8 million of the 5 0 million population 148 With the ruling elite split into pro German and pro Entente factions Romania remained neutral in 1914 arguing like Italy that because Austria Hungary had declared war on Serbia it was under no obligation to join them 149 They maintained this position for the next two years while allowing Germany and Austria to transport military supplies and advisors across Romanian territory 150 In September 1914 Russia had acknowledged Romanian rights to Austro Hungarian territories including Transylvania and Banat whose acquisition had widespread popular support 148 and Russian success against Austria led Romania to join the Entente in the August 1916 Treaty of Bucharest 150 Under the strategic plan known as Hypothesis Z the Romanian army planned an offensive into Transylvania while defending Southern Dobruja and Giurgiu against a possible Bulgarian counterattack 151 On 27 August 1916 they attacked Transylvania and occupied substantial parts of the province before being driven back by the recently formed German 9th Army led by former Chief of Staff Falkenhayn 152 A combined German Bulgarian Turkish offensive captured Dobruja and Giurgiu although the bulk of the Romanian army managed to escape encirclement and retreated to Bucharest which surrendered to the Central Powers on 6 December 1916 153 nbsp Romanian troops during the Battle of Mărășești 1917On 7 May 1918 Romania signed the Treaty of Bucharest with the Central Powers which recognised Romanian sovereignty over Bessarabia in return for ceding control of passes in the Carpathian Mountains to Austria Hungary and granting oil concessions to Germany 154 Although approved by Parliament Ferdinand I refused to sign the treaty hoping for an Allied victory Romania re entered the war on 10 November 1918 on the side of the Allies and the Treaty of Bucharest was formally annulled by the Armistice of 11 November 1918 155 m Between 1914 and 1918 an estimated 400 000 to 600 000 ethnic Romanians served with the Austro Hungarian army of whom up to 150 000 were killed in action total military and civilian deaths within contemporary Romanian borders are estimated at 748 000 157 Eastern Front Main article Eastern Front World War I Initial actions nbsp Emperor Nicholas II and Grand Duke Nikolaevich following the Russian capture of Przemysl the longest siege of the war As previously agreed with France Russian plans at the start of the war were to simultaneously advance into Austrian Galicia and East Prussia as soon as possible Although their attack on Galicia was largely successful and the invasions achieved their aim of forcing Germany to divert troops from the Western Front the speed of mobilisation meant they did so without much of their heavy equipment and support functions These weaknesses contributed to Russian defeats at Tannenberg and the Masurian Lakes in August and September 1914 forcing them to withdraw from East Prussia with heavy losses 158 159 By spring 1915 they had also retreated from Galicia and the May 1915 Gorlice Tarnow offensive then allowed the Central Powers to invade Russian occupied Poland 160 On 5 August the loss of Warsaw forced the Russians to abandon their Polish territories citation needed Despite the successful June 1916 Brusilov offensive against the Austrians in eastern Galicia 161 shortages of supplies heavy losses and command failures prevented the Russians from fully exploiting their victory However it was one of the most significant and impactful offensives of the war diverting German resources from Verdun relieving Austro Hungarian pressure on the Italians and convincing Romania to enter the war on the side of the Allies on 27 August It also fatally weakened both the Austrian and Russian armies whose offensive capabilities were badly affected by their losses and increased the disillusionment with the war that ultimately led to the Russian revolutions 162 Meanwhile unrest grew in Russia as the Tsar remained at the front with the home front controlled by Empress Alexandra Her increasingly incompetent rule and food shortages in urban areas led to widespread protests and the murder of her favourite Grigori Rasputin at the end of 1916 163 Central Powers peace overtures nbsp They shall not pass a phrase typically associated with the defence of VerdunOn 12 December 1916 after ten brutal months of the Battle of Verdun and a successful offensive against Romania Germany attempted to negotiate a peace with the Allies 164 However this attempt was rejected out of hand as a duplicitous war ruse 164 Soon after US president Woodrow Wilson attempted to intervene as a peacemaker asking in a note for both sides to state their demands and start negotiations Lloyd George s War Cabinet considered the German offer to be a ploy to create divisions amongst the Allies After initial outrage and much deliberation they took Wilson s note as a separate effort signalling that the United States was on the verge of entering the war against Germany following the submarine outrages While the Allies debated a response to Wilson s offer the Germans chose to rebuff it in favour of a direct exchange of views Learning of the German response the Allied governments were free to make clear demands in their response of 14 January They sought restoration of damages the evacuation of occupied territories reparations for France Russia and Romania and a recognition of the principle of nationalities 165 This included the liberation of Italians Slavs Romanians Czecho Slovaks and the creation of a free and united Poland 165 On the question of security the Allies sought guarantees that would prevent or limit future wars complete with sanctions as a condition of any peace settlement 166 The negotiations failed and the Entente powers rejected the German offer on the grounds that Germany had not put forward any specific proposals citation needed Final years of the war Main article Timeline of World War I 1917 1918 Russian Revolution and withdrawal Main articles Russian Revolution February Revolution and October Revolution By the end of 1916 Russian casualties totalled nearly five million killed wounded or captured with major urban areas affected by food shortages and high prices In March 1917 Tsar Nicholas ordered the military to forcibly suppress a wave of strikes in Petrograd but the troops refused to fire on the crowds 167 Revolutionaries set up the Petrograd Soviet and fearing a left wing takeover the State Duma forced Nicholas to abdicate and established the Russian Provisional Government which confirmed Russia s willingness to continue the war However the Petrograd Soviet refused to disband creating competing power centres and caused confusion and chaos with frontline soldiers becoming increasingly demoralised and unwilling to fight on 168 Following the Tsar s abdication Vladimir Lenin with the help of the German government was ushered by train from Switzerland into Russia on 16 April 1917 Discontent and the weaknesses of the Provisional Government led to a rise in the popularity of the Bolshevik Party led by Lenin which demanded an immediate end to the war The Revolution of November was followed in December by an armistice and negotiations with Germany At first the Bolsheviks refused the German terms but when German troops began marching across Ukraine unopposed the new government acceded to the Treaty of Brest Litovsk on 3 March 1918 The treaty ceded vast territories including Finland Estonia Latvia Lithuania parts of Poland and Ukraine to the Central Powers 169 With the Russian Empire out of the war Romania found itself alone on the Eastern Front and signed the Treaty of Bucharest with the Central Powers in May 1918 ending the state of war between Romania and the Central Powers Under the terms of the treaty Romania had to give territory to Austria Hungary and Bulgaria and lease its oil reserves to Germany However the terms also included the Central Powers recognition of the union of Bessarabia with Romania 170 171 United States enters the war Main article American entry into World War I nbsp President Wilson asking Congress to declare war on Germany 2 April 1917The United States was a major supplier of war materiel to the Allies but remained neutral in 1914 in large part due to domestic opposition 172 The most significant factor in creating the support Wilson needed was the German submarine offensive which not only cost American lives but paralysed trade as ships were reluctant to put to sea 173 On 6 April 1917 Congress declared war on Germany as an Associated Power of the Allies 174 The United States Navy sent a battleship group to Scapa Flow to join the Grand Fleet and provided convoy escorts In April 1917 the United States Army had fewer than 300 000 men including National Guard units compared to British and French armies of 4 1 and 8 3 million respectively The Selective Service Act of 1917 drafted 2 8 million men although training and equipping such numbers was a huge logistical challenge By June 1918 over 667 000 members of the American Expeditionary Forces AEF had been transported to France a figure which reached 2 million by the end of November 175 Despite his conviction Germany must be defeated Wilson went to war to ensure the US played a leading role in shaping the peace which meant preserving the AEF as a separate military force rather than being absorbed into British or French units as his Allies wanted 176 He was strongly supported by AEF commander General John J Pershing a proponent of pre 1914 open warfare who considered the French and British emphasis on artillery as misguided and incompatible with American offensive spirit 177 Much to the frustration of his Allies who had suffered heavy losses in 1917 he insisted on retaining control of American troops and refused to commit them to the front line until able to operate as independent units As a result the first significant US involvement was the Meuse Argonne offensive in late September 1918 178 Nivelle Offensive April May 1917 Further information Nivelle offensive and 1917 French Army mutinies nbsp French infantry advance on the Chemin des Dames April 1917In December 1916 Robert Nivelle replaced Petain as commander of French armies on the Western Front and began planning a spring attack in Champagne part of a joint Franco British operation Nivelle claimed the capture of his main objective the Chemin des Dames would achieve a massive breakthrough and cost no more than 15 000 casualties 179 Poor security meant German intelligence was well informed on tactics and timetables but despite this when the attack began on 16 April the French made substantial gains before being brought to a halt by the newly built and extremely strong defences of the Hindenburg Line Nivelle persisted with frontal assaults and by 25 April the French had suffered nearly 135 000 casualties including 30 000 dead most incurred in the first two days 180 nbsp Canadian Corps troops at the Battle of Vimy Ridge 1917Concurrent British attacks at Arras were more successful although ultimately of little strategic value 181 Operating as a separate unit for the first time the Canadian Corps capture of Vimy Ridge during the battle is viewed by many Canadians as a defining moment in creating a sense of national identity 182 183 Although Nivelle continued the offensive on 3 May the 21st Division which had been involved in some of the heaviest fighting at Verdun refused orders to go into battle initiating the French Army mutinies within days acts of collective indiscipline had spread to 54 divisions while over 20 000 deserted 184 Unrest was almost entirely confined to the infantry whose demands were largely non political including better economic support for families at home and regular periods of leave which Nivelle had ended 185 Sinai and Palestine campaign 1917 1918 Main article Sinai and Palestine campaign nbsp British artillery battery on Mount Scopus in the Battle of Jerusalem 1917 Foreground a battery of 16 heavy guns Background conical tents and support vehicles In March and April 1917 at the First and Second Battles of Gaza German and Ottoman forces stopped the advance of the Egyptian Expeditionary Force which had begun in August 1916 at the Battle of Romani 186 187 At the end of October the Sinai and Palestine campaign resumed when General Edmund Allenby s XXth Corps XXI Corps and Desert Mounted Corps won the Battle of Beersheba 188 Two Ottoman armies were defeated a few weeks later at the Battle of Mughar Ridge and early in December Jerusalem was captured following another Ottoman defeat at the Battle of Jerusalem 189 190 191 About this time Friedrich Freiherr Kress von Kressenstein was relieved of his duties as the Eighth Army s commander replaced by Djevad Pasha and a few months later the commander of the Ottoman Army in Palestine Erich von Falkenhayn was replaced by Otto Liman von Sanders 192 193 In early 1918 the front line was extended and the Jordan Valley was occupied following the First Transjordan and the Second Transjordan attacks by British Empire forces in March and April 1918 194 German spring offensive March July 1918 Main article German spring offensiveIn December 1917 the Central Powers signed an armistice with Russia thus freeing large numbers of German troops for use in the west With German reinforcements and new American troops pouring in the outcome was to be decided on the Western Front The Central Powers knew that they could not win a protracted war but they held high hopes for success based on a final quick offensive Furthermore both sides became increasingly fearful of social unrest and revolution in Europe Thus both sides urgently sought a decisive victory 195 Ludendorff drew up plans codenamed Operation Michael for the 1918 offensive on the Western Front The spring offensive sought to divide the British and French forces with a series of feints and advances The German leadership hoped to end the war before significant US forces arrived The operation commenced on 21 March 1918 with an attack on British forces near Saint Quentin German forces achieved an unprecedented advance of 60 kilometres 37 mi 196 nbsp French soldiers under General Gouraud with machine guns amongst the ruins of a church near the Marne 1918The initial offensive was so successful that Kaiser Wilhelm II declared 24 March a national holiday Many Germans thought victory was near After heavy fighting however the offensive was halted Lacking tanks or motorised artillery the Germans were unable to consolidate their gains The problems of re supply were also exacerbated by increasing distances that now stretched over terrain that was shell torn and often impassable to traffic 197 Following Operation Michael Germany launched Operation Georgette against the northern English Channel ports The Allies halted the drive after limited territorial gains by Germany The German Army to the south then conducted Operations Blucher and Yorck pushing broadly towards Paris Germany launched Operation Marne Second Battle of the Marne on 15 July in an attempt to encircle Reims The resulting counter attack which started the Hundred Days Offensive marked the first successful Allied offensive of the war By 20 July the Germans had retreated across the Marne to their starting lines 198 Hundred Days Offensive August November 1918 Main article Hundred Days Offensive nbsp Between April and November 1918 the Allies increased their front line rifle strength while German strength fell by half 199 The Allied counteroffensive known as the Hundred Days Offensive began on 8 August 1918 with the Battle of Amiens The battle involved over 400 tanks and 120 000 British Dominion and French troops and by the end of its first day a gap 24 kilometres 15 mi long had been created in the German lines The defenders displayed a marked collapse in morale causing Ludendorff to refer to this day as the Black Day of the German army 200 201 202 Allied advance to the Hindenburg Line nbsp An American gun crew from the 23rd Infantry 2nd Division firing on German entrenched positions during the Meuse Argonne offensive 1918See also Meuse Argonne offensive In September the Allies advanced to the Hindenburg Line in the north and centre The Germans continued to fight strong rear guard actions and launched numerous counterattacks but positions and outposts of the Line continued to fall with the BEF alone taking 30 441 prisoners in the last week of September On 24 September an assault by both the British and French came within 3 kilometres 2 mi of St Quentin The Germans had now retreated to positions along or behind the Hindenburg Line That same day Supreme Army Command informed the leaders in Berlin that armistice talks were inevitable 203 The final assault on the Hindenburg Line began with the Meuse Argonne offensive launched by American and French troops on 26 September The following week co operating American and French units broke through in Champagne at the Battle of Blanc Mont Ridge forcing the Germans off the commanding heights and closing towards the Belgian frontier 204 On 8 October the line was pierced again by British and Dominion troops at the Battle of Cambrai 205 Breakthrough of Macedonian Front September 1918 Main articles Vardar offensive and Battle of Dobro Pole nbsp Bulgarian major Ivanov with white flag surrendering to Serbian 7th Danube regiment near KumanovoAllied forces started the Vardar offensive on 15 September at two key points Dobro Pole and near Dojran Lake In the Battle of Dobro Pole the Serbian and French armies had success after a three day long battle with relatively small casualties and subsequently made a breakthrough in the front something which was rarely seen in World War I After the front was broken Allied forces started to liberate Serbia and reached Skopje at 29 September after which Bulgaria signed an armistice with the Allies on 30 September 206 207 Armistices and capitulations Main articles Armistice of Salonica Armistice of Villa Giusti and Armistice of Mudros Further information Armistice of Belgrade nbsp Italian troops reach Trento during the Battle of Vittorio Veneto 1918The collapse of the Central Powers came swiftly Bulgaria was the first to sign an armistice the Armistice of Salonica on 29 September 1918 208 German Emperor Wilhelm II in a telegram to Bulgarian Tsar Ferdinand I described the situation thus Disgraceful 62 000 Serbs decided the war 209 210 On the same day the German Supreme Army Command informed Kaiser Wilhelm II and the Imperial Chancellor Count Georg von Hertling that the military situation facing Germany was hopeless 211 On 24 October the Italians began a push that rapidly recovered territory lost after the Battle of Caporetto This culminated in the Battle of Vittorio Veneto which marked the end of the Austro Hungarian Army as an effective fighting force The offensive also triggered the disintegration of the Austro Hungarian Empire During the last week of October declarations of independence were made in Budapest Prague and Zagreb On 29 October the imperial authorities asked Italy for an armistice but the Italians continued advancing reaching Trento Udine and Trieste On 3 November Austria Hungary sent a flag of truce to ask for an armistice Armistice of Villa Giusti The terms arranged by telegraph with the Allied Authorities in Paris were communicated to the Austrian commander and accepted The Armistice with Austria was signed in the Villa Giusti near Padua on 3 November Austria and Hungary signed separate armistices following the overthrow of the Habsburg monarchy In the following days the Italian Army occupied Innsbruck and all Tyrol with over 20 000 soldiers 212 On 30 October the Ottoman Empire capitulated signing the Armistice of Mudros 208 German Revolution 1918 1919 Main articles German Revolution of 1918 1919 and Weimar Republic nbsp German Revolution Kiel 1918In northern Germany the German Revolution of 1918 1919 began at the end of October 1918 Units of the German Navy refused to set sail for a last large scale operation in a war they believed to be as good as lost initiating the uprising The sailors revolt which then ensued in the naval ports of Wilhelmshaven and Kiel spread across the whole country within days and led to the proclamation of a republic on 9 November 1918 shortly thereafter to the abdication of Kaiser Wilhelm II and to German surrender 213 214 215 216 New German government surrenders Main article Armistice of 11 November 1918 nbsp Ferdinand Foch second from right pictured outside the carriage in Compiegne after agreeing to the armistice that ended the war there 217 With the military faltering and with widespread loss of confidence in the Kaiser leading to his abdication and fleeing of the country Germany moved towards surrender Prince Maximilian of Baden took charge of a new government on 3 October as Chancellor of Germany to negotiate with the Allies Negotiations with President Wilson began immediately in the hope that he would offer better terms than the British and French Wilson demanded a constitutional monarchy and parliamentary control over the German military 218 There was no resistance when the Social Democrat Philipp Scheidemann on 9 November declared Germany to be a republic The Kaiser kings and other hereditary rulers all were removed from power and Wilhelm fled to exile in the Netherlands It was the end of Imperial Germany a new Germany had been born as the Weimar Republic 219 On 11 November at 5 00 am an armistice with Germany was signed in a railroad carriage at Compiegne At 11 am on 11 November 1918 a ceasefire came into effect During the six hours between the signing of the armistice and its taking effect opposing armies on the Western Front began to withdraw from their positions but fighting continued along many areas of the front as commanders wanted to capture territory before the war ended The occupation of the Rhineland took place following the Armistice citation needed AftermathMain article Aftermath of World War I In the aftermath of the war four empires disappeared the German Austro Hungarian Ottoman and Russian n Numerous nations regained their former independence and new ones were created Four dynasties together with their ancillary aristocracies fell as a result of the war the Romanovs the Hohenzollerns the Habsburgs and the Ottomans Belgium and Serbia were badly damaged as was France with 1 4 million soldiers dead 220 not counting other casualties Germany and Russia were similarly affected 221 Formal end of the war nbsp The signing of the Treaty of Versailles in the Hall of Mirrors Versailles 28 June 1919 by Sir William OrpenA formal state of war between the two sides persisted for another seven months until the signing of the Treaty of Versailles with Germany on 28 June 1919 The United States Senate did not ratify the treaty despite public support for it 222 223 and did not formally end its involvement in the war until the Knox Porter Resolution was signed on 2 July 1921 by President Warren G Harding 224 For the United Kingdom and the British Empire the state of war ceased under the provisions of the Termination of the Present War Definition Act 1918 with respect to Germany on 10 January 1920 225 Austria on 16 July 1920 226 Bulgaria on 9 August 1920 227 Hungary on 26 July 1921 228 Turkey on 6 August 1924 229 nbsp Greek prime minister Eleftherios Venizelos signing the Treaty of SevresAfter the Treaty of Versailles treaties with Austria Hungary Bulgaria and the Ottoman Empire were signed The Ottoman Empire disintegrated with much of its Levant territory awarded to various Allied powers as protectorates The Turkish core in Anatolia was reorganised as the Republic of Turkey The Ottoman Empire was to be partitioned by the Treaty of Sevres of 1920 This treaty was never ratified by the Sultan and was rejected by the Turkish National Movement leading to the victorious Turkish War of Independence and the much less stringent 1923 Treaty of Lausanne citation needed Some war memorials date the end of the war as being when the Versailles Treaty was signed in 1919 which was when many of the troops serving abroad finally returned home by contrast most commemorations of the war s end concentrate on the armistice of 11 November 1918 230 Legally the formal peace treaties were not complete until the last the Treaty of Lausanne was signed Under its terms the Allied forces left Constantinople on 23 August 1923 citation needed Peace treaties and national boundaries nbsp Map of territorial changes in Europe after World War I as of 1923 After the war there grew a certain amount of academic focus on the causes of war and on the elements that could make peace flourish In part these led to the institutionalization of peace and conflict studies security studies and International Relations IR in general 231 The Paris Peace Conference imposed a series of peace treaties on the Central Powers officially ending the war The 1919 Treaty of Versailles dealt with Germany and building on Wilson s 14th point brought into being the League of Nations on 28 June 1919 232 233 The Central Powers had to acknowledge responsibility for all the loss and damage to which the Allied and Associated Governments and their nationals have been subjected as a consequence of the war imposed upon them by their aggression In the Treaty of Versailles this statement was Article 231 This article became known as the War Guilt clause as the majority of Germans felt humiliated and resentful 234 Overall the Germans felt they had been unjustly dealt with by what they called the diktat of Versailles German historian Hagen Schulze said the Treaty placed Germany under legal sanctions deprived of military power economically ruined and politically humiliated 235 Belgian historian Laurence Van Ypersele emphasises the central role played by memory of the war and the Versailles Treaty in German politics in the 1920s and 1930s Active denial of war guilt in Germany and German resentment at both reparations and continued Allied occupation of the Rhineland made widespread revision of the meaning and memory of the war problematic The legend of the stab in the back and the wish to revise the Versailles diktat and the belief in an international threat aimed at the elimination of the German nation persisted at the heart of German politics Even a man of peace such as Gustav Stresemann publicly rejected German guilt As for the Nazis they waved the banners of domestic treason and international conspiracy in an attempt to galvanise the German nation into a spirit of revenge Like a Fascist Italy Nazi Germany sought to redirect the memory of the war to the benefit of its own policies 236 Meanwhile new nations liberated from German rule viewed the treaty as recognition of wrongs committed against small nations by much larger aggressive neighbours 237 The Peace Conference required all the defeated powers to pay reparations for all the damage done to civilians However owing to economic difficulties and Germany being the only defeated power with an intact economy the burden fell largely on Germany citation needed nbsp Dissolution of Austria Hungary after warAustria Hungary was partitioned into several successor states largely but not entirely along ethnic lines Apart from Austria and Hungary Czechoslovakia Italy Poland Romania and Yugoslavia received territories from the Dual Monarchy the formerly separate and autonomous Kingdom of Croatia Slavonia was incorporated into Yugoslavia The details were contained in the Saint Germain en Laye and the Treaty of Trianon As a result Hungary lost 64 of its total population decreasing from 20 9 million to 7 6 million and losing 31 3 3 out of 10 7 million of its ethnic Hungarians 238 According to the 1910 census speakers of the Hungarian language included approximately 54 of the entire population of the Kingdom of Hungary Within the country numerous ethnic minorities were present 16 1 Romanians 10 5 Slovaks 10 4 Germans 2 5 Ruthenians 2 5 Serbs and 8 others 239 Between 1920 and 1924 354 000 Hungarians fled former Hungarian territories attached to Romania Czechoslovakia and Yugoslavia 240 The Russian Empire which had withdrawn from the war in 1917 after the October Revolution lost much of its western frontier as the newly independent nations of Estonia Finland Latvia Lithuania and Poland were carved from it Romania took control of Bessarabia in April 1918 241 National identities Further information Sykes Picot AgreementAfter 123 years Poland re emerged as an independent country The Kingdom of Serbia and its dynasty as a minor Entente nation and the country with the most casualties per capita 242 243 244 became the backbone of a new multinational state the Kingdom of Serbs Croats and Slovenes later renamed Yugoslavia Czechoslovakia combining the Kingdom of Bohemia with parts of the Kingdom of Hungary became a new nation Romania would unite all Romanian speaking people under a single state leading to Greater Romania 245 Russia became the Soviet Union and lost Finland Estonia Lithuania and Latvia which became independent countries The Ottoman Empire was soon replaced by Turkey and several other countries in the Middle East citation needed In the British Empire the war unleashed new forms of nationalism In Australia and New Zealand the Battle of Gallipoli became known as those nations Baptism of Fire It was the first major war in which the newly established countries fought and it was one of the first times that Australian troops fought as Australians not just subjects of the British Crown and independent national identities for these nations took hold Anzac Day commemorating the Australian and New Zealand Army Corps ANZAC celebrates this defining moment 246 247 In the aftermath of World War I Greece fought against Turkish nationalists led by Mustafa Kemal a war that eventually resulted in a massive population exchange between the two countries under the Treaty of Lausanne 248 According to various sources 249 several hundred thousand Greeks died during this period which was tied in with the Greek genocide 250 Health effects nbsp Transporting Ottoman wounded at SirkeciOf the 60 million European military personnel who were mobilised from 1914 to 1918 8 million were killed 7 million were permanently disabled and 15 million were seriously injured Germany lost 15 1 of its active male population Austria Hungary lost 17 1 and France lost 10 5 251 France mobilised 7 8 million men of which 1 4 million died and 3 2 million were injured 252 Among the soldiers mutilated and surviving in the trenches approximately 15 000 sustained horrific facial injuries causing them to undergo social stigma and marginalisation they were called the gueules cassees In Germany civilian deaths were 474 000 higher than in peacetime due in large part to food shortages and malnutrition that weakened resistance to disease These excess deaths are estimated as 271 000 in 1918 plus another 71 000 in the first half of 1919 when the blockade was still in effect 253 By the end of the war starvation caused by famine had killed approximately 100 000 people in Lebanon 254 Between 5 and 10 million people died in the Russian famine of 1921 255 By 1922 there were between 4 5 million and 7 million homeless children in Russia as a result of nearly a decade of devastation from World War I the Russian Civil War and the subsequent famine of 1920 1922 256 Numerous anti Soviet Russians fled the country after the Revolution by the 1930s the northern Chinese city of Harbin had 100 000 Russians 257 Thousands more emigrated to France England and the United States nbsp Emergency military hospital during the Spanish flu pandemic which killed about 675 000 people in the United States alone Camp Funston Kansas 1918Diseases flourished in the chaotic wartime conditions In 1914 alone louse borne epidemic typhus killed 200 000 in Serbia 258 From 1918 to 1922 Russia had about 25 million infections and 3 million deaths from epidemic typhus 259 In 1923 13 million Russians contracted malaria a sharp increase from the pre war years 260 Starting in early 1918 a major influenza epidemic known as Spanish flu spread around the world accelerated by the movement of large number of soldiers often crammed together in camps and transport ships with poor sanitation Overall the Spanish flu killed at least 17 million to 25 million people 261 262 including an estimated 2 64 million Europeans and as many as 675 000 Americans 263 Moreover between 1915 and 1926 an epidemic of encephalitis lethargica spread around the world affecting nearly five million people 264 265 War crimesMain page Category World War I crimes Rape of Belgium Main article Rape of Belgium The German invaders treated any resistance such as sabotaging rail lines as illegal and immoral and shot the offenders and burned buildings in retaliation In addition they tended to suspect that most civilians were potential francs tireurs guerrillas and accordingly took and sometimes killed hostages from among the civilian population The German army executed over 6 500 French and Belgian civilians between August and November 1914 usually in near random large scale shootings of civilians ordered by junior German officers The German Army destroyed 15 000 20 000 buildings most famously the university library at Leuven and generated a wave of refugees of over a million people Over half the German regiments in Belgium were involved in major incidents 266 Thousands of workers were shipped to Germany to work in factories British propaganda dramatising the Rape of Belgium attracted much attention in the United States while Berlin said it was both lawful and necessary because of the threat of franc tireurs like those in France in 1870 267 The British and French magnified the reports and disseminated them at home and in the United States where they played a major role in dissolving support for Germany 268 269 Austro Hungarian war crimes in Serbia nbsp Austro Hungarian soldiers executing men and women in Serbia 1916 270 Austria s propaganda machinery spread anti Serb sentiment with the slogan Serbien muss sterbien Serbia must die 271 During the war Austro Hungarian officers in Serbia ordered troops to exterminate and burn everything that is Serbian and hangings and mass shootings were everyday occurrences 271 Austrian historian Anton Holzer wrote that the Austro Hungarian army carried out countless and systematic massacres against the Serbian population The soldiers invaded villages and rounded up unarmed men women and children They were either shot dead bayoneted to death or hanged The victims were locked into barns and burned alive Women were sent up to the front lines and mass raped The inhabitants of whole villages were taken as hostages and humiliated and tortured 272 A claim from a local spy that traitors were hiding in a certain house was enough to sentence the whole family to death by hanging Priests were often hanged under the accusation of spreading the spirit of treason among the people Multiple source state that 30 000 Serbs mostly civilians were hanged by Austro Hungarian forces in the first year of the war alone 271 Baralong incidents Main article Baralong incidents nbsp HMS BaralongOn 19 August 1915 the German submarine U 27 was sunk by the British Q ship HMS Baralong All German survivors were summarily executed by Baralong s crew on the orders of Lieutenant Godfrey Herbert the captain of the ship The shooting was reported to the media by American citizens who were on board the Nicosia a British freighter loaded with war supplies which was stopped by U 27 just minutes before the incident 273 On 24 September Baralong destroyed U 41 which was in the process of sinking the cargo ship Urbino According to Karl Goetz the submarine s commander Baralong continued to fly the US flag after firing on U 41 and then rammed the lifeboat carrying the German survivors sinking it 274 Torpedoing of HMHS Llandovery Castle See also Unrestricted submarine warfare The Canadian hospital ship HMHS Llandovery Castle was torpedoed by the German submarine SM U 86 on 27 June 1918 in violation of international law Only 24 of the 258 medical personnel patients and crew survived Survivors reported that the U boat surfaced and ran down the lifeboats machine gunning survivors in the water The U boat captain Helmut Brummer Patzig was charged with war crimes in Germany following the war but escaped prosecution by going to the Free City of Danzig beyond the jurisdiction of German courts 275 Blockade of Germany Main article Blockade of Germany 1914 1919 After the war the German government claimed that approximately 763 000 German civilians died from starvation and disease during the war because of the Allied blockade 276 277 An academic study done in 1928 put the death toll at 424 000 278 Germany protested that the Allies had used starvation as a weapon of war 279 Sally Marks argued that the German accounts of a hunger blockade are a myth as Germany did not face the starvation level of Belgium and the regions of Poland and northern France that it occupied 280 According to the British judge and legal philosopher Patrick Devlin The War Orders given by the Admiralty on 26 August 1914 were clear enough All food consigned to Germany through neutral ports was to be captured and all food consigned to Rotterdam was to be presumed consigned to Germany According to Devlin this was a serious breach of International Law equivalent to German minelaying 281 Chemical weapons in warfare Main article Chemical weapons in World War I nbsp French soldiers making a gas and flame attack on German trenches in FlandersThe German army was the first to successfully deploy chemical weapons during the Second Battle of Ypres 22 April 25 May 1915 after German scientists working under the direction of Fritz Haber at the Kaiser Wilhelm Institute developed a method to weaponize chlorine o 282 The use of chemical weapons was sanctioned by the German High Command in an effort to force Allied soldiers out of their entrenched positions complementing rather than supplanting more lethal conventional weapons 282 In time chemical weapons were deployed by all major belligerents throughout the war inflicting approximately 1 3 million casualties but relatively few fatalities About 90 000 in total 282 For example there were an estimated 186 000 British chemical weapons casualties during the war 80 of which were the result of exposure to the vesicant sulfur mustard introduced to the battlefield by the Germans in July 1917 which burns the skin at any point of contact and inflicts more severe lung damage than chlorine or phosgene 282 and up to one third of American casualties were caused by them The Russian Army reportedly suffered roughly 500 000 chemical weapon casualties in World War I 283 The use of chemical weapons in warfare was in direct violation of the 1899 Hague Declaration Concerning Asphyxiating Gases and the 1907 Hague Convention on Land Warfare which prohibited their use 284 285 The effect of poison gas was not limited to combatants Civilians were at risk from the gases as winds blew the poison gases through their towns and they rarely received warnings or alerts of potential danger In addition to absent warning systems civilians often did not have access to effective gas masks An estimated 100 000 260 000 civilian casualties were caused by chemical weapons during the conflict and tens of thousands more along with military personnel died from scarring of the lungs skin damage and cerebral damage in the years after the conflict ended Many commanders on both sides knew such weapons would cause major harm to civilians but nonetheless continued to use them British Field Marshal Douglas Haig wrote in his diary My officers and I were aware that such weapons would cause harm to women and children living in nearby towns as strong winds were common in the battlefront However because the weapon was to be directed against the enemy none of us were overly concerned at all 286 287 288 289 The war damaged the prestige of chemistry in European societies in particular the German variety 290 Massacres of Albanians Main article Massacres of Albanians in World War I During the Balkan Wars Albanians were massacred by members of the Balkan League mostly by Serbian and Montenegrin forces These massacres continued during the First World War as foreign armies entered Albania Bulgarian Serbian Montenegrin and Greek forces committed several atrocities in Albania during occupation and in other regions inhabited by Albanians Many villages were burned and destroyed leaving 330 000 people without homes by 1915 291 According to the Committee of Kosovo 50 000 Albanians were killed by Bulgarian forces and around 200 000 Albanians were killed by Serbian and Montenegrin forces 292 Genocide and ethnic cleansing Ottoman Empire Main articles Armenian genocide Sayfo and Greek genocide See also Late Ottoman genocides and Armenian genocide denial nbsp Armenians killed during the Armenian genocide Image taken from Ambassador Morgenthau s Story written by Henry Morgenthau Sr and published in 1918 293 The ethnic cleansing of the Ottoman Empire s Armenian population including mass deportations and executions during the final years of the Ottoman Empire is considered genocide 294 The Ottomans carried out organised and systematic massacres of the Armenian population at the beginning of the war and manipulated acts of Armenian resistance by portraying them as rebellions to justify further extermination 295 In early 1915 a number of Armenians volunteered to join the Russian forces and the Ottoman government used this as a pretext to issue the Tehcir Law Law on Deportation which authorised the deportation of Armenians from the Empire s eastern provinces to Syria between 1915 and 1918 The Armenians were intentionally marched to death and a number were attacked by Ottoman brigands 296 While an exact number of deaths is unknown the International Association of Genocide Scholars estimates 1 5 million 294 297 The government of Turkey has consistently denied the genocide arguing that those who died were victims of inter ethnic fighting famine or disease during World War I these claims are rejected by most historians 298 Other ethnic groups were similarly attacked by the Ottoman Empire during this period including Assyrians and Greeks and some scholars consider those events to be part of the same policy of extermination 299 300 301 At least 250 000 Assyrian Christians about half of the population and 350 000 750 000 Anatolian and Pontic Greeks were killed between 1915 and 1922 302 Russian Empire Main articles Pogroms in the Russian Empire and Pogroms of the Russian Civil War See also Central Asian revolt of 1916 Many pogroms accompanied the Russian Revolution of 1917 and the ensuing Russian Civil War 60 000 200 000 civilian Jews were killed in the atrocities throughout the former Russian Empire mostly within the Pale of Settlement in present day Ukraine 303 There were an estimated 7 12 million casualties during the Russian Civil War mostly civilians 304 Soldiers experiencesMain articles List of last surviving World War I veterans World War I casualties Commonwealth War Graves Commission and American Battle Monuments Commission Allied personnel was around 42 928 000 while Central personnel was near 25 248 000 221 305 The British soldiers of the war were initially volunteers but increasingly were conscripted into service Surviving veterans returning home often found they could discuss their experiences only amongst themselves Grouping together they formed veterans associations or Legions A small number of personal accounts of American veterans have been collected by the Library of Congress Veterans History Project 306 Prisoners of war Main article World War I prisoners of war in Germany nbsp German prisoners in a French prison camp during the later part of the warAbout eight million soldiers surrendered and were held in POW camps during the war All nations pledged to follow the Hague Conventions on fair treatment of prisoners of war and the survival rate for POWs was generally much higher than that of combatants at the front 307 Individual surrenders were uncommon large units usually surrendered en masse At the siege of Maubeuge about 40 000 French soldiers surrendered at the battle of Galicia Russians took about 100 000 to 120 000 Austrian captives at the Brusilov Offensive about 325 000 to 417 000 Germans and Austrians surrendered to Russians and at the Battle of Tannenberg 92 000 Russians surrendered When the besieged garrison of Kaunas surrendered in 1915 some 20 000 Russians became prisoners at the battle near Przasnysz February March 1915 14 000 Germans surrendered to Russians and at the First Battle of the Marne about 12 000 Germans surrendered to the Allies citation needed 25 31 of Russian losses as a proportion of those captured wounded or killed were to prisoner status for Austria Hungary 32 for Italy 26 for France 12 for Germany 9 for Britain 7 Prisoners from the Allied armies totalled about 1 4 million not including Russia which lost 2 5 3 5 million soldiers as prisoners From the Central Powers about 3 3 million soldiers became prisoners most of them surrendered to Russians 308 Germany held 2 5 million prisoners Russia held 2 2 2 9 million while Britain and France held about 720 000 Most were captured just before the Armistice The United States held 48 000 citation needed The most dangerous moment was the act of surrender when helpless soldiers were sometimes gunned down 309 310 Once prisoners reached a camp conditions were in general satisfactory and much better than in World War II thanks in part to the efforts of the International Red Cross and inspections by neutral nations However conditions were terrible in Russia Starvation was common for prisoners and civilians alike About 15 20 of the prisoners in Russia died and in Central Powers imprisonment 8 of Russians 311 In Germany food was scarce but only 5 died 312 313 314 nbsp British prisoners guarded by Ottoman forces after the First Battle of Gaza in 1917The Ottoman Empire often treated POWs poorly 315 Some 11 800 British Empire soldiers most of them Indians became prisoners after the siege of Kut in Mesopotamia in April 1916 4 250 died in captivity 316 Although many were in a poor condition when captured Ottoman officers forced them to march 1 100 kilometres 684 mi to Anatolia A survivor said We were driven along like beasts to drop out was to die 317 The survivors were then forced to build a railway through the Taurus Mountains While the Allied prisoners of the Central Powers were quickly sent home at the end of active hostilities the same treatment was not granted to Central Power prisoners of the Allies and Russia many of whom served as forced labour e g in France until 1920 They were released only after many approaches by the Red Cross to the Supreme War Council 318 German prisoners were still being held in Russia as late as 1924 319 Military attaches and war correspondents Main article List of military attaches and war correspondents in World War I Military and civilian observers from every major power closely followed the course of the war Many were able to report on events from a perspective somewhat akin to modern embedded positions within the opposing land and naval forces Conscription Conscription was common in most European countries However it was controversial in English speaking countries It was especially unpopular among minority ethnic groups especially the Irish Catholics in Ireland and Australia and the French Catholics in Canada 320 Canada Main article Conscription Crisis of 1917 In Canada the issue produced a major political crisis that permanently alienated the Francophones It opened a political gap between French Canadians who believed their true loyalty was to Canada and not to the British Empire and members of the Anglophone majority who saw the war as a duty to their British heritage 321 Australia Main article Conscription in Australia nbsp Military recruitment in Melbourne Australia 1914Australia had a form of conscription at the outbreak of the war as compulsory military training had been introduced in 1911 However the Defence Act 1903 provided that unexempted males could be called upon only for home defence during times of war not overseas service Prime Minister Billy Hughes wished to amend the legislation to require conscripts to serve overseas and held two non binding referendums one in 1916 and again in 1917 in order to secure public support 322 Both were defeated by narrow margins with farmers the labour movement the Catholic Church and Irish Australians combining to campaign for the No vote 323 The issue of conscription caused the 1916 Australian Labor Party split Hughes and his supporters were expelled from the party forming the National Labor Party and then the Nationalist Party Despite the referendum results the Nationalists won a landslide victory at the 1917 federal election 322 Britain Main article Conscription in the United Kingdom See also Recruitment to the British Army during the First World War nbsp British volunteer recruits in London August 1914In Britain conscription resulted in the calling up of nearly every physically fit man in Britain six of ten million eligible Of these about 750 000 died Most deaths were those of young unmarried men however 160 000 wives lost husbands and 300 000 children lost fathers 324 Conscription during the First World War began when the British government passed the Military Service Act in 1916 The act specified that single men aged 18 to 40 years old were liable to be called up for military service unless they were widowed with children or ministers of a religion There was a system of Military Service Tribunals to adjudicate upon claims for exemption upon the grounds of performing civilian work of national importance domestic hardship health and conscientious objection The law went through several changes before the war ended Married men were exempt in the original Act although this was changed in June 1916 The age limit was also eventually raised to 51 years old Recognition of work of national importance also diminished and in the last year of the war there was some support for the conscription of clergy 325 United States Main article Conscription in the United States World War I nbsp A United States Army recruiting poster shows Uncle Sam pointing his finger at the viewer to try and persuade them to enlist in the U S Army during World War I In the United States conscription began in 1917 and was generally well received with a few pockets of opposition in isolated rural areas 326 The administration decided to rely primarily on conscription rather than voluntary enlistment to raise military manpower after only 73 000 volunteers enlisted out of the initial 1 million target in the first six weeks of the war 327 In 1917 10 million men were registered This was deemed to be inadequate so age ranges were increased and exemptions reduced and so by the end of 1918 this increased to 24 million men that were registered with nearly 3 million inducted into the military services The draft was universal and included blacks on the same terms as whites although they served in different units In all 367 710 black Americans were drafted 13 of total compared to 2 442 586 white 87 of total citation needed Austria Hungary Like all the armies of mainland Europe Austria Hungary relied on conscription to fill its ranks Officer recruitment however was voluntary The effect of this at the start of the war was that well over a quarter of the rank and file were Slavs while more than 75 of the officers were ethnic Germans This was much resented The army has been described as being run on colonial lines and the Slav soldiers as disaffected Thus conscription contributed greatly to Austria s disastrous performance on the battlefield 328 Economic effectsMain articles Economic history of World War I and Post World War I recession Further information Home front during World War IMacro and micro economic consequences devolved from the war Families were altered by the departure of many men With the death or absence of the primary wage earner women were forced into the workforce in unprecedented numbers At the same time industry needed to replace the lost labourers sent to war This aided the struggle for voting rights for women 329 nbsp Poster showing women workers 1915In all nations the government s share of GDP increased surpassing 50 in both Germany and France and nearly reaching that level in Britain To pay for purchases in the United States Britain cashed in its extensive investments in American railroads and then began borrowing heavily from Wall Street President Wilson was on the verge of cutting off the loans in late 1916 but allowed a great increase in US government lending to the Allies After 1919 the US demanded repayment of these loans The repayments were in part funded by German reparations that in turn were supported by American loans to Germany This circular system collapsed in 1931 and some loans were never repaid Britain still owed the United States 4 4 billion p of World War I debt in 1934 the last installment was finally paid in 2015 330 Britain turned to her colonies for help in obtaining essential war materials whose supply from traditional sources had become difficult Geologists such as Albert Kitson were called on to find new resources of precious minerals in the African colonies Kitson discovered important new deposits of manganese used in munitions production in the Gold Coast 331 Article 231 of the Treaty of Versailles the so called war guilt clause stated Germany accepted responsibility for all the loss and damage to which the Allied and Associated Governments and their nationals have been subjected as a consequence of the war imposed upon them by the aggression of Germany and her allies 332 It was worded as such to lay a legal basis for reparations and a similar clause was inserted in the treaties with Austria and Hungary However neither of them interpreted it as an admission of war guilt 333 In 1921 the total reparation sum was placed at 132 billion gold marks However Allied experts knew that Germany could not pay this sum The total sum was divided into three categories with the third being deliberately designed to be chimerical and its primary function was to mislead public opinion into believing the total sum was being maintained 334 Thus 50 billion gold marks 12 5 billion dollars represented the actual Allied assessment of German capacity to pay and therefore represented the total German reparations figure that had to be paid 334 This figure could be paid in cash or in kind coal timber chemical dyes etc In addition some of the territory lost via the treaty of Versailles was credited towards the reparation figure as were other acts such as helping to restore the Library of Louvain 335 By 1929 the Great Depression arrived causing political chaos throughout the world 336 In 1932 the payment of reparations was suspended by the international community by which point Germany had paid only the equivalent of 20 598 billion gold marks in reparations 337 With the rise of Adolf Hitler all bonds and loans that had been issued and taken out during the 1920s and early 1930s were cancelled David Andelman notes refusing to pay doesn t make an agreement null and void The bonds the agreement still exist Thus following the Second World War at the London Conference in 1953 Germany agreed to resume payment on the money borrowed On 3 October 2010 Germany made the final payment on these bonds q The Australian prime minister Billy Hughes wrote to the British prime minister David Lloyd George You have assured us that you cannot get better terms I much regret it and hope even now that some way may be found of securing agreement for demanding reparation commensurate with the tremendous sacrifices made by the British Empire and her Allies Australia received 5 571 720 war reparations but the direct cost of the war to Australia had been 376 993 052 and by the mid 1930s repatriation pensions war gratuities interest and sinking fund charges were 831 280 947 342 Of about 416 000 Australians who served about 60 000 were killed and another 152 000 were wounded 221 The war contributed to the evolution of the wristwatch from women s jewellery to a practical everyday item replacing the pocketwatch which requires a free hand to operate 343 Trench watches were designed for use by the military as pocket watches were not as effective for combat Military funding of advancements in radio contributed to the post war popularity of the medium 343 Support and opposition for the warSupport nbsp Poster urging women to join the British war effort published by the Young Women s Christian AssociationIn the Balkans Yugoslav nationalists such as the leader Ante Trumbic strongly supported the war desiring the freedom of Yugoslavs from Austria Hungary and other foreign powers and the creation of an independent Yugoslavia The Yugoslav Committee led by Trumbic was formed in Paris on 30 April 1915 but shortly moved its office to London 344 In April 1918 the Rome Congress of Oppressed Nationalities met including Czechoslovak Italian Polish Transylvanian and Yugoslav representatives who urged the Allies to support national self determination for the peoples residing within Austria Hungary 345 In the Middle East Arab nationalism soared in Ottoman territories in response to the rise of Turkish nationalism during the war with Arab nationalist leaders advocating the creation of a pan Arab state In 1916 the Arab Revolt began in Ottoman controlled territories of the Middle East in an effort to achieve independence 346 In East Africa Iyasu V of Ethiopia was supporting the Dervish state who were at war with the British in the Somaliland campaign 347 Von Syburg the German envoy in Addis Ababa said now the time has come for Ethiopia to regain the coast of the Red Sea driving the Italians home to restore the Empire to its ancient size The Ethiopian Empire was on the verge of entering World War I on the side of the Central Powers before Iyasu s overthrow at the Battle of Segale due to Allied pressure on the Ethiopian aristocracy 348 Iyasu was accused of converting to Islam 349 According to Ethiopian historian Bahru Zewde the evidence used to prove Iyasu s conversion was a doctored photo of Iyasu wearing a turban provided by the Allies 350 Some historians claim the British spy T E Lawrence forged the Iyasu photo 351 nbsp Bermuda Volunteer Rifle Corps First Contingent in Bermuda winter 1914 1915 before joining 1 Lincolnshire Regiment in France in June 1915 The dozen remaining after Guedecourt on 25 September 1916 merged with a Second Contingent The two contingents suffered 75 casualties A number of socialist parties initially supported the war when it began in August 1914 345 But European socialists split on national lines with the concept of class conflict held by radical socialists such as Marxists and syndicalists being overborne by their patriotic support for the war 352 Once the war began Austrian British French German and Russian socialists followed the rising nationalist current by supporting their countries intervention in the war 353 Italian nationalism was stirred by the outbreak of the war and was initially strongly supported by a variety of political factions One of the most prominent and popular Italian nationalist supporters of the war was Gabriele D Annunzio who promoted Italian irredentism and helped sway the Italian public to support intervention in the war 354 The Italian Liberal Party under the leadership of Paolo Boselli promoted intervention in the war on the side of the Allies and used the Dante Alighieri Society to promote Italian nationalism 355 Italian socialists were divided on whether to support the war or oppose it some were militant supporters of the war including Benito Mussolini and Leonida Bissolati 356 However the Italian Socialist Party decided to oppose the war after anti militarist protestors were killed resulting in a general strike called Red Week 357 The Italian Socialist Party purged itself of pro war nationalist members including Mussolini 357 Mussolini a syndicalist who supported the war on grounds of irredentist claims on Italian populated regions of Austria Hungary formed the pro interventionist Il Popolo d Italia and the Fasci Rivoluzionario d Azione Internazionalista Revolutionary Fasci for International Action in October 1914 that later developed into the Fasci Italiani di Combattimento in 1919 the origin of fascism 358 Mussolini s nationalism enabled him to raise funds from Ansaldo an armaments firm and other companies to create Il Popolo d Italia to convince socialists and revolutionaries to support the war 359 Patriotic Funds On both sides there was large scale fundraising for soldiers welfare their dependents and for those injured The Nail Men were a German example Around the British empire there were many Patriotic Funds including the Royal Patriotic Fund Corporation Canadian Patriotic Fund Queensland Patriotic Fund and by 1919 there were 983 funds in New Zealand 360 At the start of the next world war the New Zealand funds were reformed having been criticised as overlapping wasteful and abused 361 but 11 were still functioning in 2002 362 Opposition Main articles Opposition to World War I and 1917 French Army mutinies nbsp The Deserter 1916 Anti war cartoon depicting Jesus facing a firing squad with soldiers from five European countries Many countries jailed those who spoke out against the conflict These included Eugene Debs in the United States and Bertrand Russell in Britain In the US the Espionage Act of 1917 and Sedition Act of 1918 made it a federal crime to oppose military recruitment or make any statements deemed disloyal Publications at all critical of the government were removed from circulation by postal censors 363 and many served long prison sentences for statements of fact deemed unpatriotic nbsp Sackville Street now O Connell Street after the 1916 Easter Rising in DublinA number of nationalists opposed intervention particularly within states that the nationalists were hostile to Although the vast majority of Irish people consented to participate in the war in 1914 and 1915 a minority of advanced Irish nationalists staunchly opposed taking part 364 The war began amid the Home Rule crisis in Ireland that had resurfaced in 1912 and by July 1914 there was a serious possibility of an outbreak of civil war in Ireland Irish nationalists and Marxists attempted to pursue Irish independence culminating in the Easter Rising of 1916 with Germany sending 20 000 rifles to Ireland to stir unrest in Britain 365 The UK government placed Ireland under martial law in response to the Easter Rising though once the immediate threat of revolution had dissipated the authorities did try to make concessions to nationalist feeling 366 However opposition to involvement in the war increased in Ireland resulting in the Conscription Crisis of 1918 Other opposition came from conscientious objectors some socialist some religious who refused to fight In Britain 16 000 people asked for conscientious objector status 367 Some of them most notably prominent peace activist Stephen Hobhouse refused both military and alternative service 368 Many suffered years of prison including solitary confinement and bread and water diets Even after the war in Britain many job advertisements were marked No conscientious objectors need apply 369 On 1 4 May 1917 about 100 000 workers and soldiers of Petrograd and after them the workers and soldiers of other Russian cities led by the Bolsheviks demonstrated under banners reading Down with the war and all power to the soviets The mass demonstrations resulted in a crisis for the Russian Provisional Government 370 In Milan in May 1917 Bolshevik revolutionaries organised and engaged in rioting calling for an end to the war and managed to close down factories and stop public transportation 371 The Italian army was forced to enter Milan with tanks and machine guns to face Bolsheviks and anarchists who fought violently until 23 May when the army gained control of the city Almost 50 people including three Italian soldiers were killed and over 800 people arrested 371 TechnologySee also Technology during World War I Ground warfare See also Tanks in World War I nbsp Tanks on parade in London at the end of World War IWorld War I began as a clash of 20th century technology and 19th century tactics with the inevitably large ensuing casualties By the end of 1917 however the major armies now numbering millions of men had modernised and were making use of telephone wireless communication 372 armoured cars tanks especially with the advent of the first prototype tank Little Willie and aircraft 373 Artillery also underwent a revolution In 1914 cannons were positioned in the front line and fired directly at their targets By 1917 indirect fire with guns as well as mortars and even machine guns was commonplace using new techniques for spotting and ranging notably aircraft and the often overlooked field telephone 374 nbsp 38 cm Lange Max of Koekelare Leugenboom the biggest gun in the world in 1917Germany was far ahead of the Allies in using heavy indirect fire The German Army employed 150 mm 6 in and 210 mm 8 in howitzers in 1914 when typical French and British guns were only 75 mm 3 in and 105 mm 4 in The British had a 6 inch 152 mm howitzer but it was so heavy it had to be hauled to the field in pieces and assembled The Germans also fielded Austrian 305 mm 12 in and 420 mm 17 in guns and even at the beginning of the war had inventories of various calibres of Minenwerfer which were ideally suited for trench warfare 375 376 Much of the combat involved trench warfare in which hundreds often died for each metre gained Many of the deadliest battles in history occurred during World War I Such battles include Ypres the Marne Cambrai the Somme Verdun and Gallipoli The Germans employed the Haber process of nitrogen fixation to provide their forces with a constant supply of gunpowder despite the British naval blockade 377 Artillery was responsible for the largest number of casualties and consumed vast quantities of explosives 378 nbsp A Canadian soldier with mustard gas burns c 1917 1918The widespread use of chemical warfare was a distinguishing feature of the conflict Gases used included chlorine mustard gas and phosgene Relatively few war casualties were caused by gas 379 as effective countermeasures to gas attacks were quickly created such as gas masks The use of chemical warfare and small scale strategic bombing as opposed to tactical bombing were both outlawed by the Hague Conventions of 1899 and 1907 and both proved to be of limited effectiveness 380 though they captured the public imagination 381 The most powerful land based weapons were railway guns weighing dozens of tons apiece 382 nbsp British Vickers machine gun 1917Naval nbsp The Moltke class SMS GoebenGermany deployed U boats submarines after the war began Alternating between restricted and unrestricted submarine warfare in the Atlantic the Imperial German Navy employed them to deprive the British Isles of vital supplies The deaths of British merchant sailors and the seeming invulnerability of U boats led to the development of depth charges 1916 hydrophones sonar 1917 blimps hunter killer submarines HMS R 1 1917 forward throwing anti submarine weapons and dipping hydrophones the latter two both abandoned in 1918 109 To extend their operations the Germans proposed supply submarines 1916 Most of these would be forgotten in the interwar period until World War II revived the need 383 Aviation Main article Aviation in World War I nbsp Royal Air Force Sopwith Camel In April 1917 the average life expectancy of a British pilot on the Western Front was 93 flying hours 384 Fixed wing aircraft were first used militarily by the Italians in Libya on 23 October 1911 during the Italo Turkish War for reconnaissance soon followed by the dropping of grenades and aerial photography the next year By 1914 their military utility was obvious They were initially used for reconnaissance and ground attack To shoot down enemy planes anti aircraft guns and fighter aircraft were developed Strategic bombers were created principally by the Germans and British though the former used Zeppelins as well 385 Towards the end of the conflict aircraft carriers were used for the first time with HMS Furious launching Sopwith Camels in a raid to destroy the Zeppelin hangars at Tonder in 1918 386 nbsp Luftstreitkrafte Fokker Dr I being inspected by Manfred von Richthofen also known as the Red Baron Manned observation balloons floating high above the trenches were used as stationary reconnaissance platforms reporting enemy movements and directing artillery Balloons commonly had a crew of two equipped with parachutes 387 so that if there was an enemy air attack the crew could parachute to safety At the time parachutes were too heavy to be used by pilots of aircraft with their marginal power output and smaller versions were not developed until the end of the war they were also opposed by the British leadership who feared they might promote cowardice 388 Recognised for their value as observation platforms balloons were important targets for enemy aircraft To defend them against air attack they were heavily protected by anti aircraft guns and patrolled by friendly aircraft to attack them unusual weapons such as air to air rockets were tried Thus the reconnaissance value of blimps and balloons contributed to the development of air to air combat between all types of aircraft and to the trench stalemate because it was impossible to move large numbers of troops undetected The Germans conducted air raids on England during 1915 and 1916 with airships hoping to damage British morale and cause aircraft to be diverted from the front lines and indeed the resulting panic led to the diversion of several squadrons of fighters from France 385 388 Radio telecommunication nbsp Mobile radio station in German South West Africa using a hydrogen balloon to lift the antennaThe introduction of radio telegraphy was a significant step in communication during World War I The stations utilised at that time were spark gap transmitters As an example the information of the start of World War I was transmitted to German South West Africa on 2 August 1914 via radio telegraphy from the Nauen transmitter station via a relay station in Kamina and Lome in Togo to the radio station in Windhoek citation needed DiplomacyMain article Diplomatic history of World War I nbsp 1917 political cartoon about the Zimmermann Telegram The message was intercepted by the British its publication caused outrage and contributed to the U S entry into World War I The non military diplomatic and propaganda interactions among the nations were designed to build support for the cause or to undermine support for the enemy For the most part wartime diplomacy focused on five issues propaganda campaigns defining and redefining the war goals which became harsher as the war went on luring neutral nations Italy Ottoman Empire Bulgaria Romania into the coalition by offering slices of enemy territory and encouragement by the Allies of nationalistic minority movements inside the Central Powers especially among Czechs Poles and Arabs In addition there were multiple peace proposals coming from neutrals or one side or the other none of them progressed very far 389 390 391 Legacy and memoryFurther information Zone rouge and Iron harvest Strange friend I said Here is no cause to mourn None said the other Save the undone years Wilfred Owen Strange Meeting 1918 392 The first tentative efforts to comprehend the meaning and consequences of modern warfare began during the initial phases of the war and this process continued throughout and after the end of hostilities and is still underway more than a century later As late as 2007 signs warning visitors to keep off certain paths at battlefield sites like Verdun and Somme remained in place as unexploded ordnance continued to pose a danger to farmers living near former battlegrounds In France and Belgium locals who discover caches of unexploded munitions are assisted by weapons disposal units In some places plant life has still not returned to normal 393 Historiography Further information Historiography of the causes of World War I Teaching World War I has presented special challenges When compared with World War II the First World War is often thought to be a wrong war fought for the wrong reasons It lacks the metanarrative of good versus evil that characterizes the Second World War Lacking recognizable heroes and villains it is often taught thematically invoking tropes like the wastefulness of war the folly of generals and the innocence of soldiers The complexity of the conflict is mostly obscured by these oversimplifications 393 George Kennan referred to the war as the seminal catastrophe of the 20th century 394 Historian Heather Jones argues that the historiography has been reinvigorated by the cultural turn in recent years Scholars have raised entirely new questions regarding military occupation radicalisation of politics race medical science gender and mental health Furthermore new research has revised our understanding of five major topics that historians have long debated Why the war began why the Allies won whether generals were responsible for high casualty rates how the soldiers endured the horrors of trench warfare and to what extent the civilian homefront accepted and endorsed the war effort 395 396 Memorials Main article World War I memorials nbsp The Italian Redipuglia War Memorial which contains the remains of 100 187 soldiersMemorials were erected in thousands of villages and towns Close to battlefields those buried in improvised burial grounds were gradually moved to formal graveyards under the care of organisations such as the Commonwealth War Graves Commission the American Battle Monuments Commission the German War Graves Commission and Le Souvenir francais Many of these graveyards also have central monuments to the missing or unidentified dead such as the Menin Gate Memorial to the Missing and the Thiepval Memorial to the Missing of the Somme citation needed In 1915 John McCrae a Canadian army doctor wrote the poem In Flanders Fields as a salute to those who perished in the Great War Published in Punch on 8 December 1915 it is still recited today especially on Remembrance Day and Memorial Day 397 398 nbsp A typical village war memorial to soldiers killed in World War INational World War I Museum and Memorial in Kansas City Missouri is a memorial dedicated to all Americans who served in World War I The Liberty Memorial was dedicated on 1 November 1921 when the supreme Allied commanders spoke to a crowd of more than 100 000 people 399 The UK Government has budgeted substantial resources to the commemoration of the war during the period 2014 to 2018 The lead body is the Imperial War Museum 400 On 3 August 2014 French President Francois Hollande and German President Joachim Gauck together marked the centenary of Germany s declaration of war on France by laying the first stone of a memorial in Vieil Armand known in German as Hartmannswillerkopf for French and German soldiers killed in the war 401 During the Armistice centenary commemorations French President Emmanuel Macron and German Chancellor Angela Merkel visited the site of the signing of the Armistice of Compiegne and unveiled a plaque to reconciliation 402 Cultural memory Further information World War I in popular culture The examples and perspective in this section deal primarily with the United Kingdom and do not represent a worldwide view of the subject You may improve this section discuss the issue on the talk page or create a new section as appropriate June 2017 Learn how and when to remove this template message nbsp nbsp Left John McCrae author of In Flanders FieldsRight Siegfried Sassoon World War I had a lasting impact on collective memory It was seen by many in Britain as signalling the end of an era of stability stretching back to the Victorian period and across Europe many regarded it as a watershed 403 Historian Samuel Hynes explained A generation of innocent young men their heads full of high abstractions like Honour Glory and England went off to war to make the world safe for democracy They were slaughtered in stupid battles planned by stupid generals Those who survived were shocked disillusioned and embittered by their war experiences and saw that their real enemies were not the Germans but the old men at home who had lied to them They rejected the values of the society that had sent them to war and in doing so separated their own generation from the past and from their cultural inheritance 404 This has become the most common perception of World War I perpetuated by the art cinema poems and stories published subsequently Films such as All Quiet on the Western Front Paths of Glory and King and Country have perpetuated the idea while war time films including Camrades Poppies of Flanders and Shoulder Arms indicate that the most contemporary views of the war were overall far more positive 405 Likewise the art of Paul Nash John Nash Christopher Nevinson and Henry Tonks in Britain painted a negative view of the conflict in keeping with the growing perception while popular war time artists such as Muirhead Bone painted more serene and pleasant interpretations subsequently rejected as inaccurate 404 Several historians like John Terraine Niall Ferguson and Gary Sheffield have challenged these interpretations as partial and polemical views These beliefs did not become widely shared because they offered the only accurate interpretation of wartime events In every respect the war was much more complicated than they suggest In recent years historians have argued persuasively against almost every popular cliche of World War I It has been pointed out that although the losses were devastating their greatest impact was socially and geographically limited The many emotions other than horror experienced by soldiers in and out of the front line including comradeship boredom and even enjoyment have been recognised The war is not now seen as a fight about nothing but as a war of ideals a struggle between aggressive militarism and more or less liberal democracy It has been acknowledged that British generals were often capable men facing difficult challenges and that it was under their command that the British army played a major part in the defeat of the Germans in 1918 a great forgotten victory 405 Though these views have been discounted as myths 404 406 they are common They have dynamically changed according to contemporary influences reflecting in the 1950s perceptions of the war as aimless following the contrasting Second World War and emphasising conflict within the ranks during times of class conflict in the 1960s The majority of additions to the contrary are often rejected 405 Writers such as Ernest Hemingway wrote many stories on the experiences of veterans after the war such as the short story Soldier s Home about young veteran Harold Krebs trying to integrate back into society 407 Social trauma nbsp A 1919 book for veterans from the US War DepartmentThe social trauma caused by unprecedented rates of casualties manifested itself in different ways which have been the subject of subsequent historical debate 408 Over 8 million Europeans died in the war Millions suffered permanent disabilities The war gave birth to fascism and Bolshevism and destroyed the dynasties that had ruled the Ottoman Habsburg Russian and German Empires 393 The optimism of la belle epoque was destroyed and those who had fought in the war were referred to as the Lost Generation 409 For years afterward people mourned the dead the missing and the many disabled 410 Many soldiers returned with severe trauma suffering from shell shock also called neurasthenia a condition related to post traumatic stress disorder 411 Many more returned home with few after effects however their silence about the war contributed to the conflict s growing mythological status Though many participants did not share in the experiences of combat or spend any significant time at the front or had positive memories of their service the images of suffering and trauma became the widely shared perception Such historians as Dan Todman Paul Fussell and Samuel Heyns have all published works since the 1990s arguing that these common perceptions of the war are factually incorrect 408 Discontent in Germany and Austria The rise of Nazism and fascism included a revival of the nationalist spirit and a rejection of many post war changes Similarly the popularity of the stab in the back legend German Dolchstosslegende was a testament to the psychological state of defeated Germany and was a rejection of responsibility for the conflict This conspiracy theory of the betrayal of the German war effort by Jews became common and the German populace came to see themselves as victims The widespread acceptance of the stab in the back theory delegitimised the Weimar government and destabilised the system opening it to extremes of right and left The same occurred in Austria which did not consider itself responsible for the outbreak of the war and claimed not to have suffered a military defeat 412 Communist and fascist movements around Europe drew strength from this theory and enjoyed a new level of popularity These feelings were most pronounced in areas directly or harshly affected by the war Adolf Hitler was able to gain popularity by using German discontent with the still controversial Treaty of Versailles 413 World War II was in part a continuation of the power struggle never fully resolved by World War I Furthermore it was common for Germans in the 1930s to justify acts of aggression due to perceived injustices imposed by the victors of World War I 414 415 416 American historian William Rubinstein wrote that The Age of Totalitarianism included nearly all the infamous examples of genocide in modern history headed by the Jewish Holocaust but also comprising the mass murders and purges of the Communist world other mass killings carried out by Nazi Germany and its allies and also the Armenian Genocide of 1915 All these slaughters it is argued here had a common origin the collapse of the elite structure and normal modes of government of much of central eastern and southern Europe as a result of World War I without which surely neither Communism nor Fascism would have existed except in the minds of unknown agitators and crackpots 417 See also nbsp World War I portal nbsp World portalLists of World War I topics List of military engagements of World War I Outline of World War I World War I casualties World warFootnotes Russian Empire during 1914 1917 Russian Republic during 1917 The Bolshevik government signed a separate peace with the Central Powers shortly after their armed seizure of power resulting in a Central Powers victory on the Eastern Front of the war and Russian defeat However this peace treaty was nullified by an Allied Powers victory on the Western Front and the end of the war Following the Armistice of Focșani causing Romania to withdraw from the Eastern Front of World War I Romania signed a peace treaty with the Central Powers on 7 May 1918 however the treaty was canceled by Romania and Romania itself rejoined the Allied Powers on 10 November 1918 The United States did not ratify any of the treaties agreed to at the Paris Peace Conference Bulgaria joined the Central Powers on 14 October 1915 The Ottoman Empire agreed to a secret alliance with Germany on 2 August 1914 It joined the war on the side of the Central Powers on 29 October 1914 The United States declared war on Austria Hungary on 7 December 1917 Austria was considered one of the successor states to Austria Hungary The United States declared war on Germany on 6 April 1917 Hungary was considered one of the successor states to Austria Hungary Although the Treaty of Sevres was intended to end the war between the Allied Powers and the Ottoman Empire the Allied Powers and the Republic of Turkey the successor state of the Ottoman Empire agreed to the Treaty of Lausanne Only the Triple Alliance was a formal alliance the others listed were informal patterns of support Cvjetko Popovic Gavrilo Princip Nedeljko Cabrinovic Trifko Grabez and Vaso Cubrilovic were Bosnian Serbs while Muhamed Mehmedbasic was from the Bosniak Muslim community 32 Bessarabia remained part of Romania until 1940 when it was annexed by Joseph Stalin as the Moldavian Soviet Socialist Republic 156 following the dissolution of the USSR in 1991 it became the independent Republic of Moldova Unlike the others the successor state to the Russian Empire the Union of Soviet Socialist Republics retained similar external borders via retaining or quickly recovering lost territories A German attempt to use chemical weapons on the Russian front in January 1915 failed to cause casualties 109 in this context see Long and short scales World War I officially ended when Germany paid off the final amount of reparations imposed on it by the Allies 338 339 340 341 References Shapiro amp Epstein 2006 p 329 Proffitt Michael 13 June 2014 Chief Editor s notes June 2014 Oxford English Dictionary s blog Archived from the original on 15 April 2022 Retrieved 25 April 2022 The First World War Quite Interesting Archived from the original on 3 January 2014 Also aired on QI Series I Episode 2 16 September 2011 BBC Two Were they always called World War I and World War II Ask History Archived from the original on 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