Zach Sane World War I Timeline By facebooker_10214941872931477 Jun 28, 1914 The Assassination of Archduke Franz Ferdinand of Austria and Sophie, Duchess of Hohenberg. Jul 28, 1914 Austria-Hungary declares war on Serbia Jul 30, 1914 Russia proclaims general mobilization Aug 1, 1914 Germany declares war on Russia Aug 3, 1914 Germany declares war on France Aug 4, 1914 Britain declares war on Germany Aug 6, 1914 Austria-Hungary declares war on Russia Aug 12, 1914 France and Britain declare war on Austria-Hungary Apr 6, 1917 The United States declared war on Germany Nov 11, 1918 A ceasefire and Armistice was declared Jun 28, 1919 Treaty of Versailles