A film adaptation of the short story of the same name by Guy de Maupassant. The action takes place in the XIX century. Franco-Prussian War of 1870. A group of French bourgeois leaves in a stagecoach from Rouen occupied by Prussian troops. Along with them comes one attractive demimonde lady. The only way to get out is to persuade her, nicknamed "Ball-of-Fat" a la "Boule-de-Suif" to satisfy the lust of the head of the gendarmerie...
At the amateur talent show the boy, accompanying himself on the accordion, sings a song about Moscow... The plot of the movie is based on the story of the director of the school about how this accordion, once belonging to a cadre worker who died during a demonstration in 1905, has been in many hands before it got to the guys.
During the war years, russian soldiers pick up an orphaned boy. He refuses to go to the rear and becomes a scout, and then remains with the artillery battery. When the calculation of the battery dies in battle with the German tanks that have broken through, Vanya is sent to the Suvorov School, whose students participate in a military parade on Red Square.
