Cavalrymen on horseback gallop across the field to the railway, where an armored train stands on the tracks (footage of the chronicle). Parade on Red Square, dedicated to the 15th anniversary of the Red Army; from the rostrum of the Mausoleum, the parade participants are greeted by I. Stalin, K. Voroshilov, V. Molotov. Combat, physical training of Red fighters. Boys - pupils of the cavalry regiment feed the horses, read books in the reading room. Models of military ships and aircraft "Maxim Gorky", made by the hands of the regiment's pupils. Pioneers learn to shoot at a target from a bow, get acquainted with a gas mask, train in running in bags. Demonstration of German pioneers on the streets of Berlin, a rally, pioneers speak from the podium in defense of the USSR.