World War I By Zavaren Apr 25, 1914 The Battle of Gallipoli Jun 28, 1914 Assassination of Archduke Franz Ferdinand Aug 1, 1914 Germany declares war on Russia Aug 3, 1914 Germany delcares war on France Aug 26, 1914 Battle of Tannenburg May 7, 1915 Lusitania is sunk Feb 21, 1916 Battle of Verdun Apr 6, 1917 America declares war on Germany Nov 11, 1918 Germany signs the armistice Jun 28, 1919 Treaty of Versailles officially ends WWI