World War I By diesel18 Jun 28, 1914 Franz Ferdinand and his wife assassinated at Sarajevo- Bosnia Aug 8, 1914 Britain declares war on Germany Sep 11, 1914 Australian Naval forces land in New Guinea Apr 25, 1915 Australian troops land at Gallipoli Dec 19, 1915 Allies begin evacuation of Gallipoli Jul 19, 1916 Battle of the formelles And the 20th of July Oct 28, 1916 First conscription referendum in Australia is denied Apr 11, 1917 Battle of bullecourt May 3, 1917 Second Battle of Bullecourt begins Jul 31, 1917 Start of the Third Battle of Ypres Dec 20, 1917 Second conscription referendum is defeated Aug 8, 1918 German army suffers significant defeat at the Somme Jan 18, 1919 Paris peace conference begins Jun 28, 1919 Treaty of Versailles signed with germany