World War One By kgirlyw Jun 28, 1914 Austrian Archduke Franz Ferdinand assasinated Jul 5, 1914 William II promised German support for Austria against Serbia Jul 28, 1914 Austria declares war on Serbia Period: Jul 28, 1914 to Jun 28, 1919 World War One Aug 1, 1914 Germany declares war on Russia Oct 29, 1914 Turkey entered on Germany's side Apr 25, 1915 Allied forces landed in Gallipoli May 7, 1915 Lusitania is sunk Feb 21, 1916 Battle of Verdun Feb 1, 1917 USA declares war on Germany Dec 5, 1917 Armistice between Germany and Russia Jul 15, 1918 second Battle of Marne, Germany's army began to collapse Aug 1, 1918 August-Sptember Allied forces advanced successfully, Turkish forces collapsed Oct 1, 1918 October-November Turkey and Austria made peace Oct 4, 1918 Germany asked Allies for an armistice Jan 4, 1919 Peace conference at Paris Jun 28, 1919 Treaty of Versailles signed by Germans, ending war