WW1 Timeline By s07655 Jun 28, 1914 Franz Ferdinand assasinated Jul 21, 1914 Russia Mobilised its troups Aug 1, 1914 Germany delares war on Russia Aug 2, 1914 Eastern Front Formed Aug 3, 1914 Germany Declares war on France Aug 4, 1914 Britain declares war on Germany Aug 4, 1914 Western Front Formed Apr 25, 1915 Gallipoli Campaign starting Jan 9, 1916 Gallipoli Campaign Ending Jul 1, 1916 Battle of the Somme Starting Nov 18, 1916 Battle of the Somme Ending Apr 6, 1917 U.S. joins the war Nov 12, 1917 Russia bails out of the war Mar 21, 1918 Big push on the Western Front by U.S. Nov 11, 1918 War Ended Jun 28, 1919 Treaty of Versilles Signed