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1964 Russian Movie Poster. The civil war in Russia, guerrillas fighting with Kolchak formations. As a result of sabotage, an accident with white Russian train takes place. In the disaster area a flag with the inscription "Wagtail's Army" is found. Kolchak commanders think that they are Bolsheviks, but the guerrilla leader does not know anything. It turns out that this is work of three boys. (IMDB) A wagtail is a kind of small bird.