World War I By swestenstudent Jun 28, 1914 Assassination of Archduke Ferdinand and Sopie in Bosnia Jul 24, 1914 Serbia asks Germany for assistance Jul 28, 1914 Austria invaded Serbia Jul 31, 1914 Russia mobilizes to Serbian front Aug 1, 1914 Germany declares war with Russia Aug 3, 1914 Germany declares war with France Aug 4, 1914 Germany invades neutral Belgium, Britain declares war Aug 23, 1914 Japan declares war in Germany Nov 2, 1914 Russia declared war on Turkey Nov 5, 1914 Britain and France declare war on Turkey Apr 22, 1915 Introduction of weaponized chlorine gas May 7, 1915 Attack on the Lusitania by a German U-Boat May 24, 1915 Italy declares war on Austria-Hungary Feb 1, 1916 Germany begins unrestricted submarine warfare Mar 1, 1917 Publication of the Zimmerman Note Mar 8, 1917 Revolution begins in St. Petersburg, Russia Mar 16, 1917 End of the Romanov rule in Russia Apr 4, 1917 Wilson requests that the U.S. delcares war on Germany Apr 6, 1917 The U.S. enters the Great War Dec 15, 1917 Russian cease-fire treaty Nov 11, 1918 Germany surrenders
