Following the October Revolution, the staff of the old imperial military districts hindered the creation of the new Soviet Red Army, and to surmount this, a new structure was established on 31 March 1918, including the creation of the new Volga and Ural Military Districts. Much of the fighting in the Russian Civil War took place on the districts' territory. The official Russian Defence Ministry site notes the combat actions of the 20th, 21st, 24th, 25th, 26th, and 27th Rifle Divisions which took place on the eastern front of the war, as well as other formations and units.