World War l By s877733 Jun 28, 1914 Assassination of the Archduke Ferdinand Assassination of the Archduke Ferdinand Period: Jul 28, 1914 to Nov 11, 1918 Declaration of War - Austria Hungary Declaration of War - Austria Hungary Period: Sep 6, 1914 to Sep 10, 1914 First Battle of the Marne First Battle of the Marne
