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World War I
	; (Clockwise from the top) The aftermath of shelling during the Battle of the Somme; Mark V tanks cross the Hindenburg Line; HMS Irresistible sinks after hitting a mine in the Dardanelles; A British Vickers machine gun crew wears gas masks during the Battle of the Somme; Albatros D.III fighters of Jagdstaffel 11;
Date	28 July 1914 – 11 November 1918; (4 years, 3 months and 2 weeks) Peace treaties
Location	Europe, Africa, the Middle East, the Pacific Islands, China, Indian Ocean, North and South Atlantic Ocean
Result	Allied victory Central Powers victory on the Eastern Front is made worthless by defeat on the Western Front; All empires in mainland Europe collapse (including Germany, Russia, Turkey and Austria-Hungary); Russian Revolution and Russian Civil War – the Russian Empire becomes the Soviet Union; Widespread unrest and revolutions throughout Europe and Asia; Creation of the League of Nations (more...);
Territorial; changes	Formation of new countries in Europe and the Middle East; Transfer of German colonies and territories, regions of the former Ottoman Empire, regions of the former Austro-Hungarian Empire and Soviet Union territories to other countries;
Belligerents
Allied Powers: France; (1914-1918) British Empire; (1914-1918) Russia; (1914–1917) Serbia; (1914-1918) Belgium; (1914-1918) Montenegro; (1914-1918) Empire of Japan; (1914-1918) Italy; (1915–1918) United States (1917–1918); Romania; (1916–1918) Hejaz; (1916–1918) China; (1917–1918) Greece; (1917–1918) Siam; (1917–1918) ...and others;	Central Powers: German Empire; (1914-1918) Austria-Hungary; (1914-1918) Ottoman Empire; (1914-1918) ...and co-belligerents;
Commanders and leaders
Raymond Poincaré; Georges Clemenceau; Joseph Joffre; Philippe Pétain; George V; H. H. Asquith; David Lloyd George; Albert I; Nicholas II; Alexander Kerensky; Victor Emmanuel III; Vittorio Orlando; Woodrow Wilson; Yoshihito; Peter I; Ferdinand I; Eleftherios Venizelos; and others...	Wilhelm II; Franz Joseph I †; Karl I; Mehmed V †; Mehmed VI; Three Pashas; Ferdinand I; and others...
Strength
Total: 42,959,850 12,000,000; 8,841,541; 8,660,000; 5,615,140; 4,743,826; 1,234,000; 800,000; 707,343; 380,000; 250,000; 50,000;	Total: 25,248,321 13,250,000; 7,800,000; 2,998,321; 1,200,000;
Casualties and losses
Military dead: 5,525,000; Military wounded: 12,831,500; Total: 18,356,500 KIA, WIA and MIA; Civilian dead: 4,000,000; further details... Military deaths by country; 1,811,000; 1,397,800; 1,114,914; 651,000; 250,000–335,000; 275,000; 116,708; 58,637–87,500; 26,000; 3,000; 415;	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... Military deaths by country; 2,050,897; 1,200,000; 771,844; 87,500;

Map of Europe at the start of World War I. Turkey refers to the Ottoman Empire

World War I (WWI or WW1), also called the First World War, began on July 28, 1914 and lasted until November 11, 1918. It was a global war and lasted exactly 4 years, 3 months and 2 weeks. Most of the fighting was in continental Europe.

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