World War I By Soonooci Jun 28, 1914 Assassination of Archduke Ferdinand Archduke Ferdinand Period: Aug 3, 1914 to Aug 4, 1914 Britain Declaring War on Germany War on Germany Period: Oct 19, 1914 to Nov 30, 1914 First Battle of Ypres Ypres 1 Period: Apr 22, 1915 to May 15, 1915 Second Battle of Ypres Ypres May 7, 1915 The Sinking of Lusitania Lusitania Period: Sep 25, 1915 to Oct 15, 1915 Battle of Loos Loos Period: Jul 1, 1916 to Nov 1, 1916 Battle of Somme Somme Sep 15, 1916 en-masse Tank introduced en-masse Period: Oct 24, 1917 to Nov 19, 1917 Battle of Caporetto Caporetta Dec 5, 1917 Armistice Day Armistice May 28, 1918 Battle of Cantigny Cantigny Jan 4, 1919 Peace Conference Paris Jun 28, 1919 Treaty of Versailles Versailles
