World War I

World War I or the First World War (28 June 1914 – 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. It was fought between two coalitions, the Allies (primarily France, the United Kingdom, Russia, Italy, Japan and the United States) and the Central Powers (led by Germany, Austria-Hungary, and the Ottoman Empire). Fighting occurred throughout Europe, the Middle East, Africa, the Pacific, and parts of Asia. An estimated 9 million soldiers were killed in combat, plus another 23 million wounded, while 5 million civilians died as a result of military action, hunger, and disease. Millions more died as a result of genocide, while the 1918 Spanish flu pandemic was exacerbated by the movement of combatants during the war.

World War I
From 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 Kurfürst during Operation Albion (1917); German soldiers at the Battle of Verdun (1916); Aftermath of the siege of Przemyśl (1914–15); Bulgarian troops at the Monastir offensive (1916).
Date28 June 191411 November 1918
(4 years, 4 months and 2 weeks)
Peace treaties
Europe, Africa, the Middle East, the Pacific Islands, China, Indian Ocean, North and South Atlantic Ocean
Result Allied Powers victory
See Aftermath of World War I
Allied Powers:
Central Powers:
Commanders and leaders
Total: 42,928,000[1] Total: 25,248,000[1]
68,176,000 (total all)
Casualties and losses
  • Military dead: 5,525,000
  • Military wounded: 12,832,000
  • Total: 18,357,000 KIA, WIA and MIA
  • Civilian dead: 4,000,000
further details ...
  • Military dead: 4,386,000
  • Military wounded: 8,388,000
  • Total: 12,774,000 KIA, WIA and MIA
  • Civilian dead: 3,700,000
further details ...

The first decade of the 20th century saw increasing diplomatic tension between the European great powers. This reached 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, defensive alliances had drawn in Germany, France and Britain.

German strategy in 1914 was to first defeat France, then attack Russia. 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 fluid, but neither side could gain a decisive advantage, despite a series of costly offensives. Attempts by both sides to bypass the stalemate caused fighting to expand into the Middle East, the Alps, the Balkans and overseas colonies, bringing Bulgaria, Romania, Greece and others into the war.

The United States entered the war on the side of the Allies in April 1917, while the Bolsheviks seized power in the Russian October Revolution, and made peace with the Central Powers in early 1918. Freed from the Eastern Front, Germany launched an offensive in the west on March 1918, hoping to achieve a decisive victory before American troops arrived in significant numbers. Failure left the German Imperial Army exhausted and demoralised, and when the Allies took the offensive in August 1918, they could not stop the advance.

Between 29 September and 3 November 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. The Armistice of 11 November 1918 brought the fighting to a close, while the Paris Peace Conference imposed various settlements on the defeated powers, the best-known being the Treaty of Versailles. The dissolution of the Russian, German, Austro-Hungarian and Ottoman Empires resulted in the creation of new independent states, among them Poland, Czechoslovakia, and Yugoslavia. Failure to manage the instability that resulted from this upheaval during the interwar period contributed to the outbreak of World War II in September 1939.

Share this article:

This article uses material from the Wikipedia article World War I, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.