WorldWar1 by Mariha By marihathomas Jun 28, 1914 Francis Ferdinand assassinated Sarajevo Francis Ferdinand assassinated Sarajevo Period: Jun 28, 1914 to Jun 28, 1918 World War 1 Jul 28, 1914 Austria declared war on Serbia Apr 25, 1915 Allied troops landed ,Gallipoli Sep 25, 1915 Start of the Battle of Loos Jan 27, 1916 Conscription introduced in Britain Jul 1, 1916 Start of the Battle of the Somme Apr 6, 1917 USA declared war on Germany Nov 20, 1917 British tanks won a victory at Cambrai Mar 21, 1918 Germany broke through on the Somme Nov 11, 1918 The official date of the end of World War One.
