WW1 Annotated Timeline By Linyue 11 May 20, 1882 The Formation of the Triple Alliance Germany, Austria-Hungary, Italy Aug 31, 1907 The Formation of the Triple Entente Britain, France, Soviet Union (or Russia) Jun 28, 1914 The Assassination of Archduke Franz Ferdinand Jul 5, 1914 Blank Cheque Jul 23, 1914 The Ultimatum Jul 28, 1914 World War 1 Started Austria-Hungary declared the war on Serbia Period: Apr 22, 1915 to May 25, 1915 The Second Battle of Ypres Period: Jul 1, 1916 to Nov 18, 1916 Battle of Somme Period: Apr 9, 1917 to Apr 12, 1917 Battle of Vimy Ridge Period: Jul 31, 1917 to Nov 10, 1917 Battle of Passchendaele Period: Nov 20, 1917 to Dec 6, 1917 The Battle of Cambrai Nov 11, 1918 WW1 ended Germany surrendered
