The Allied intervention was a multi-national military expedition launched during the Russian Civil War in 1918. The initial goals were to help the Czechoslovak Legion, secure supplies of munitions and armaments in Russian ports, and re-establish the Eastern Front. After winning World War I, the Allies militarily backed the anti-Bolshevik White forces in Russia. Allied efforts were hampered by divided objectives, war-weariness  after the just finished greater conflict, and a lack of domestic support. These factors, together with the evacuation of the Czechoslovak Legion, compelled the Allies to withdraw from North Russia and Siberia in 1920, though Japanese forces occupied parts of Siberia until 1922 and the northern half of Sakhalin until 1925.