The World War (WW), also known as the The Great War or The War to End all Wars was a military conflict fought between July 28, 1914 and December 6, 1917. Fought primarily in Europe between all the world's great powers, assembled into two military alliances; the Triple Entente (later known as the Allied Powers) comprised of France, United Kingdom and Russia, as well as their empires, and the Triple Alliance (later known as the Central Powers) comprised of German Empire, Austria-Hungary, and Italy (who never joined the Central Powers in warfare and later joined the Allies). These alliances were both expanded as the war progressed; Italy, Japan, Bulgaria, Romania and Greece to the Allies, and the Ottoman Empire to the Central Powers.