The civil war in Russia, guerrillas fighting with Kolchak formations. As a result of sabotage, accident with white Russian train takes place. In disaster area the flag with the inscription "Wagtail's Army" is found. Kolchak commanders think that they are Bolsheviks, but guerrilla leader does not...
The film takes place during the German occupation of Ukraine in 1919, the main characters are folk characters - the brave soldier Semon Kotko and the beautiful girl Sofya.
