WW1 By lulshai Jun 28, 1914 Assassination of Archduke Franz Ferdinand of Austria Period: Jun 28, 1914 to Aug 1, 1914 WW1 1914 Jul 28, 1914 Austria-Hungary Declares War on Serbia Jul 30, 1914 German Empire Mobilizes Troops Aug 1, 1914 France mobilizes Troops, Germany declares war on Russia Apr 22, 1915 Second Battle at Ypres First use of chlorine gases Period: Apr 22, 1915 to May 7, 1915 WW1 1915 May 7, 1915 Sinking of Luistania May 23, 1915 Italy Declares war on Germany Jan 1, 1916 Mexico wants to ally with Germany, promising weapons & land Apr 6, 1916 US Congress declares war on Germany Sep 1, 1916 Tanks first used Mar 8, 1917 Russian Revolution Aug 8, 1917 Hundred Days Offensive begins Nov 11, 1918 Armistice with Germany is signed Jun 28, 1919 The Treaty of Versaillies is signed, League of Nations is created