WW1 By FrankDeAngelo Dec 5, 1912 Triple Alliance Expanded Jun 28, 1914 Assassination of Franz Ferdinand Period: Aug 1, 1914 to Aug 4, 1914 Declarations of war under terms of alliances Aug 14, 1914 Battle of Tennenberg Sep 1, 1914 Triple Entente no separate peace Sep 3, 1914 Beginning of Trench warfare Jan 1, 1915 First Zeppelin raid on Britain Apr 1, 1915 Poison gas first used May 7, 1915 Lusitania torpedoed Dec 10, 1915 Douglas Haig commander of British troops Feb 9, 1916 Conscription introduced in Britain Period: Feb 10, 1916 to Nov 1, 1916 Battle of Verdun May 31, 1916 Battle of Jutland Period: Jul 1, 1916 to Nov 1, 1916 Battle of the Somme Sep 15, 1916 Tanks first used Nov 28, 1916 First Airplane Raid Feb 15, 1917 German unrestricted U-boat campaign Apr 6, 1917 United States declared war on Germany Jul 1, 1917 Battle of Passchendaele Nov 1, 1917 Battle of Cambrai
