The first screen adaptation of an epic Russian novel about a village of Cossacks on the Don River, covering the last days of peace on the riverside before the beginning of the First World War.
The action of the movie takes place during a possible future war. A foreign state is preparing an attack on the Soviet Union. Professor Runge in his laboratory conducts an experiment with a new deadly gas. The plan of aggression is carried out. On a major Soviet industrial center the enemy command...