During the July Crisis, Nicholas supported Serbia and approved the mobilization of the Russian Army on 30 July 1914. In response, Germany declared war on Russia on 1 August 1914 and its ally France on 3 August 1914, starting the Great War, later known as the First World War. The severe military losses led to a collapse of morale at the front and at home; a general strike and a mutiny of the garrison in Petrograd sparked the February Revolution and the disintegration of the monarchy's authority. After abdicating for himself and his son, Nicholas and his family were imprisoned by the Russian Provisional Government and exiled to Siberia. After the Bolsheviks took power in the October Revolution, the family was held in Yekaterinburg, where they were executed on 17 July 1918.