WWI By s08620 Jun 28, 1914 Franz Ferdinand Assasination Period: Jun 28, 1914 to Dec 31, 1918 WWI Jul 31, 1914 Russia mobilized troupes Aug 1, 1914 Germany declares war on Russia Aug 2, 1914 Eastern front was formed Aug 3, 1914 Germany declares war on France Aug 4, 1914 Britain declares war on Germany Aug 4, 1914 Western front is formed Apr 25, 1915 Gallipoli Campaign Began Jan 9, 1916 Gallipoli Campaign ended Jul 1, 1916 Battle of the Somme Began Nov 18, 1916 Battle of the Somme Ended Mar 15, 1917 Russia pull out of the war Apr 2, 1917 America enter war Nov 12, 1917 Russia officially leave war Mar 21, 1918 Germany pushes on western front Nov 11, 1918 End of War