Timeline World War One By db5766 Jun 28, 1914 the assassination of Franz Ferdinand Jul 28, 1914 Austria declared war on Serbia Apr 22, 1915 Poison gas first used by Germans in attack on Canadians at Ypes, Belgium May 7, 1915 Sinking of the Lusitania May 31, 1915 German Zeppelins bombard suburbs of London Dec 19, 1915 The Allies started the evacuation of Gallipoli Apr 29, 1916 British forces surrendered to Turkish forces at Kut in Mesopotamia Apr 6, 1917 United States declared war on Germany Oct 23, 1917 American troops fire first shot in Trench Warfare Nov 11, 1918 Germany signed an armistice with the Allies – the official date of the end of World War One.
