World War 1 By ElleVoss Jun 23, 1914 Murder of Franz Ferdinand Period: Jun 23, 1914 to Apr 1, 1920 World War 1 Jul 28, 1914 Austrian-Hungarian Empire Declares war on Serbia Aug 3, 1914 Germany invades Belgium Aug 3, 1914 Battle of Tannenberg Aug 4, 1914 Britain declares war on Germany Because Germany invaded Belgium May 7, 1915 Sinking of the Lusitania Feb 21, 1916 Battle of Verdun May 31, 1916 Battle of Jutland Jul 1, 1916 Battle of the Somme Apr 2, 1917 US Declares War Nov 10, 1917 USSR withdraws from the War Mar 21, 1918 German Spring Offensive of 1918 Apr 1, 1918 RAF formed Jul 16, 1918 Second Battle of the Marne Nov 3, 1918 Austrian-Hungarian Empire Surrenders Nov 9, 1918 Kaiser Abdicated Nov 11, 1918 World War 1 Ends