World War I: Trenches and Somme

World War I (1914-1918) began after Archduke Franz Ferdinand of Austria was assassinated on 28 June 1914. Britain and its Allies (including France, Russia, the US, and the whole British Empire) fought the Central Powers (Germany, Austria-Hungary, Ottoman Empire). Over a million Indians fought for Britain; 40,000 died. The Battle of the Somme in July 1916 caused about 60,000 British casualties on the first day alone. The war ended at 11:00 am on 11 November 1918.