WWI By johsmi10 Period: Jan 1, 1881 to Dec 31, 1919 WWI Apr 1, 1882 Forming triple alliance Jun 28, 1914 Archduke Franz Ferdinand assasinated Sep 5, 1914 Schlieffen Plan put into effect Jul 1, 1916 Battle of verdun Aug 1, 1916 Battle of Tannenburg Feb 1, 1917 Zimmerman telegraph found Apr 2, 1917 US declares war on Germany Jan 4, 1918 The fourteen points proposed Nov 11, 1918 Armistice sighned Jun 28, 1919 Treaty of versailles sighned