Die Squaw Tschapajews (1973)

Two school classes compete against each other. The prize for the winner is a trip to the Baltic Sea. Lars, Peter and the group leader Manni are confident of victory in the cross-country game, after all they have gained experience in the game as "Chapaev's cavalry army". The first point goes to them. However, they fail the math Olympiad - an Indian movie was more important to them than learning. And before the soccer match, they split into two groups. Lars leads a pitiful remnant of Chapaev riders, while Peter plays Indians with the others. At the soccer match, they put legs on each other, and the other class wins that point too. After the defeat comes the realization: maybe they should practice "Cosmonaut" together again - until next year's competition.