WWI-Damani By facebooker_100005604883637 Jun 28, 1914 The assination of Archduke Ferdinand The Archduke Franz Ferdinand wa killed by a Serbian Natinalist while is Bosnia. Period: Jun 28, 1914 to Jun 28, 1919 WWI Jul 28, 1914 Austria-Hungary Declares War Austria-Hungary Declars war on Serbia after backdoor talks with Germany witch plegdes support Austria-Hungary in the event of a Russian Intervention. Aug 1, 1914 Schlieffen Plan Goes into effect Sep 1, 1914 First Battle of the Marne Apr 1, 1915 Gallipoli campaign May 7, 1915 Sinking of Lusitania Apr 2, 1917 America enters the War Nov 1, 1917 Russian Surrender Jul 1, 1918 Second Battle of the Marne Nov 11, 1918 Armistice Jun 28, 1919 Treaty of Versailles