This article presents the specifics of dishonourable discharge in the military criminal law of the Czechoslovak Legions in Russia. After a brief presentation of the historical background, it introduces the reader to the system of military courts and their development during the Legion's operation in Siberia as part of the Russian Civil War. Subsequently, it deals with the development of this punishment, the practice of imposing it and the consequences it brought with it, from the beginning of 1918 (before the establishment of the independent judiciary of the Czechoslovak Legion), during the early and then also the late system of courts until their abolition in 1920. The last chapter of this text focuses on shedding light on the consequences of dishonourable discharge in the interwar Czechoslovakia for those who were sentenced to it.