Allied intervention in the Russian Civil War or Allied Powers intervention in the Russian Civil War consisted of a series of multi-national military expeditions which began in 1918. The Allies first had the goal of helping the Czechoslovak Legion in securing supplies of munitions and armaments in Russian ports; during which the Czechoslovak Legion controlled the entire Trans-Siberian Railway and several major cities in Siberia at times between 1918 and 1920. By 1919 the Allied goal became to help the White forces in the Russian Civil War. When the Whites collapsed the Allies withdrew their forces from Russia by 1920 and further withdrawing from Japan by 1922.