Civil war. Polish interventionists approach Berezina. The Red Army temporarily leaves Belarusian lands. Partisan detachments are organized, one of which is led by Bolshevik Stepan. His brother, who is in collusion with Polish spy Kapusta, is also in this detachment. With Kapusta's help, Polish lancers who have appeared in the village reach the partisan camp and capture the headquarters. Yanko manages to warn the headquarters about the movement of the White Poles, and the partisans are forced to retreat through impassable swamps. They manage to escape and join the Red Army, which occupies Minsk on July 11.

Russia, 1875: In Riazan’, Dr Pavlov is summoned to a landowner who refuses to accept the inevitability of his death; to Pavlov’s dismay, he orders the destruction of a beautiful apple orchard. 1894: Experimenting on dogs, Pavlov tries to comprehend the interaction between nerves and external signals governing digestion. In 1904, he formulates the principles of conditional reflexes. When Zvantsev, an opponent of Pavlov’s materialist worldview, leaves the laboratory, the scientist hires Varvara Ivanova who becomes his most reliable assistant. 1912: Pavlov receives an honorary doctorate from Cambridge University. 1917: Despite Pavlov’s political scepticism, the Bolshevik administration treats him with great respect.

Saint Petersburg, 1858. A group of composers known as The Five meet at Balakirev's. Young Modest Mussorgsky, both a civil servant and a musician, has become a fixture there. He tells about the first opera he plans to compose. Then he goes to the country where he discovers the lowly conditions of the peasants and the bloody conflicts with the rich land owners. He works on Gogol's 'The Marriage', trying to render into music the natural accents of the play's naturalistic dialogue. But his efforts do not pan out. On the other hand, he starts writing his opera on the story of Boris Godunov. The Marinsky Theatre refuses to stage the work. The Five, and Mussorgsky among them, are libeled and the group starts disintegrating. When 'Boris Godunov' is finally performed in 1874, it is a popular success.

About the struggle of the red Army and the revolutionary workers of Petrograd against the white guards in 1919....

July-December 1917, the country is undergoing a revolution. "The pillars of society" are alarmed by the looming on them menacing events. Some of them are ready to fight with the revolution, others — among them industrialist Vasily Dostigaev trying to "adapt»

Propaganda film enhancing the role of I.V. Stalin in the defense of the city of Tsaritsyn (subsequently Stalingrad, at present Volgograd) by the red army during the Russian civil war.

Kronstadt, 1917. Sailors aboard the revolutionary cruiser Zarya prepare for a general armed uprising. Kerensky's government decides to disarm the ships. The ship's crew expels delegates from the Provisional Government, refusing to obey orders. The cruiser's commander, Bersenev, sides with the sailors. Bersenev's family members react differently to this decision. Thus, a collapse occurs in the family of an old Russian intellectual...

About how the antifascists of a Western European country in the 1930s disrupted the loading of weapons intended for the war with the Soviet Union. The film is considered lost.