Czech Legion, military force of about 40,000 to 50,000 men, composed mostly of Czech and Slovak Russian prisoners of war and deserters from the Austro-Hungarian army who enrolled in the Russian army during World War I. Constituted with the consent of the Russian revolutionary government set up in 1917, the legion took a minor part in fighting the Germans and Austrians. After Russia left the war as a result of the peace of Brest-Litovsk in 1918, an agreement between the legion and the Bolshevik regime in Russia allowed for the evacuation of the legion via the Trans-Siberian RR and its eventual transfer to the Franco-German front. During its evacuation, the legion reluctantly became involved in the Russian civil war, fighting mostly on the anti-Bolshevik side, and controlled in mid-1918 much of the vital railroad line. However, plans (favored by some Allied officials) to use the legion for intervention against the Soviet regime never materialized.
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