The war drama The Horse Patrol is an adaptation of the play of the same name by writer and military doctor František Langer. It takes place in 1919 in Russia and depicts the conflict between members of the Czechoslovak legions and Soviet agitators who are trying to forcibly integrate the legionnaires into the Red Army. Members of the legionnaire's horse patrol, led by sergeant František Matějka (Z. Štěpánek), befriend the inhabitants of a Russian village, but after a cunning attack they find themselves isolated in a lonely building. They are holding two Russian prisoners, while two of their soldiers have set out to report to their superiors. The horse patrol then loses its horse due to betrayal and must prepare for an unequal battle during a major Red Army attack...