WW1 By dee900 Jun 28, 1914 Archduke Franz Ferdinand and his wife was are assassinated. Jul 28, 1914 Austria-Hungary declares war on Serbia. Aug 1, 1914 Germany declares war on Russia. Aug 3, 1914 Germany declares war on France. Aug 4, 1914 The United Kingdom declares war on Germany Aug 19, 1914 U.S. President Woodrow Wilson announces the U.S. will remain neutral. Aug 26, 1914 The Battle of Tannenberg begins. Sep 5, 1914 The First Battle of the Marne begins. Oct 19, 1914 Battle of Ypres begins. Dec 24, 1914 The unofficial Christmas truce is declared. Feb 4, 1915 Germany declares a "war zone" around Great Britain Feb 19, 1915 The Dardanelles Campaign begins. Apr 22, 1915 The Dardanelles Campaign begins. Apr 25, 1915 The Battle of Gallipoli begins. May 7, 1915 The British ocean liner RMS Lusitania is sunk by German U-boat Feb 21, 1916 The Battle of Verdun begins. May 31, 1916 The Battle of Jutland Jul 1, 1916 The Battle of the Somme begins. Apr 6, 1917 The United States declares war on Germany. Jul 31, 1917 The Battle of Passchendaele Nov 7, 1917 The Bolsheviks successfully overthrow the Russian government during the 1917 Russian Revolution. Dec 17, 1917 The armistice agreed upon between the new Russian government and the Central Powers goes into effect. Jan 8, 1918 U.S. President Woodrow Wilson issues his Fourteen Points to peace. Mar 3, 1918 Russia signs the Treaty of Brest Litovsk, which is a peace treaty between Russia and the Central Powers. Mar 21, 1918 Germany launches the Spring Offensive. Jul 15, 1918 The Second Battle of the Marne begins. Nov 9, 1918 German Kaiser Wilhelm II abdicates and flees Germany. Nov 11, 1918 Germany signs the armistice at Compiegne Jun 28, 1919 The Treaty of Versailles officially ends WWI.