WW1 timeline By A_Hargrave1124 Jul 28, 1914 Franz Ferdinand Assassination Franz Ferdinand gets assassinated by Gavrilo Princip sparking outrage within Austria-Hungary Jul 28, 1914 Austria-Hungary declares war on Serbia This led to the start of WW1 Period: Jul 28, 1914 to Nov 11, 1918 The length of the war Aug 2, 1914 Germany invades Luxemberg Aug 2, 1914 British Forces arrive in France Aug 10, 1914 Austria-Hungary invades Russia Sep 9, 1914 Allied forces halt German naval advances Feb 18, 1915 Germany establishes naval blockade of Britain Apr 25, 1915 Allied forces on the Gallipoli Peninsula May 7, 1915 German submarine sinks passenger liner Lusitania killing 128 Americans May 23, 1915 Italy declares war on Austria-Hungary