World War I By Kiya22M Jun 28, 1914 Archduke Ferdinand Assassination of the Archduke Ferdinand Jul 27, 1914 Austria-Hungary declares war on Serbia Austria-Hungary war on Serbia May 23, 1915 Italy declares war on Austria-Hungary Italy war Austria-Hungary Period: Feb 21, 1916 to Dec 19, 1916 Battle of Verdun (1916) Battle of Verdun Mar 9, 1916 Germany declares war on Portugal Germany war on Portugal Period: May 31, 1916 to Jun 1, 1916 Battle of Jutland (Spring of 1916) Battle of Jutland Period: Jul 1, 1916 to Nov 18, 1916 Battle of the Somme (1916) Battle of the Somme Period: Nov 20, 1917 to Dec 4, 1917 Battle of Cambrai (1917) Battle of Cambrai
