World war 1 By 1702299 Aug 3, 1913 Germany declares war on France and invades Russia Germany declared war on France and invaded Belgium. Germany had to implement the Schlieffen Plan. Jun 28, 1914 Assassination Francis Ferdinand assassinated at Sarajevo Jul 5, 1914 German and Austria alliance Kaiser William II promised German support for Austria against Serbia Jul 28, 1914 Austria declared war on Serbia Aug 1, 1914 Germany Declare war on Russia Aug 4, 1914 Britain Declares war on Germany Feb 19, 1915 British Bomb Turkish forts Aug 5, 1915 Italy declare war on Germany and Austria Feb 21, 1916 Start of Battle of verdum Period: Jun 4, 1916 to Aug 10, 1916 Brusilov Offence Apr 6, 1917 USA declare war on Germany Jan 4, 1919 Peace Conference met at Paris Feb 1, 1919 Peace declared in Paris