Timeline 1914-1918 By ZANDAPANDA Jun 28, 1914 Francis Ferdinand Francis Ferdinand assassinated at Sarajevo Period: Jun 28, 1914 to Jun 28, 1918 World War 1 Jul 5, 1914 German support for Austria Kaiser William II promised German support for Austria against Serbia Jul 28, 1914 Austria declared war on Serbia Aug 1, 1914 Germany declared war on Russia Aug 3, 1914 Germany vs France Germany declared war on France and invaded Belgium. Germany had to implement the Schlieffen Plan. Aug 4, 1914 Britain declared war on Germany Jan 9, 1915 First Zeppelin raid on Britain Aug 24, 1915 Battles of Lone Pine and the Nek at Gallipoli Dec 24, 1915 The evacuation from Gallipoli Apr 29, 1916 British forces surrendered to Turkish forces at Kut in Mesopotamia Jul 1, 1916 Start of the Battle of the Somme Dec 7, 1916 Lloyd George becomes British Prime Minister Feb 1, 1917 Germany’s unrestricted submarine warfare campaign started Apr 6, 1917 USA declared war on Germany Jul 31, 1917 Start of the Third Battle at Ypres Dec 5, 1917 Armistice between Germany and Russia signed Nov 11, 1918 Germany signed an armistice with the Allies – the official date of the end of World War One.