The film tells about the training of fighters for the ski units of the Red Army. Skiers go down the mountain, bending their knees, slide down the hill, walk past the river against the backdrop of a mountain landscape. General view of a winter mountain landscape with a river and skiers moving along the track. Skiers on the way. Skiers leave the building with rifles over their shoulders, put on skis, go hiking. Skiers walk on a paved track, descend from a hill. View of a bag with a gas mask on the chest of one of the skiers. The skier takes out a gas mask, all other skiers also put on gas masks. Skiers are in gas masks, accelerating. Having passed the conditionally "contaminated area", skiers take off their gas masks. Skiers demonstrate skiing techniques that you need to know in order to be able to apply them on different parts of the terrain, depending on the ascent, descent and overcoming obstacles. Skiers on the route. Skiers demonstrate camouflage skills on the open snow plain using white camouflage robes. Then, stopping at one of the sections of the path, the skiers show their skill in throwing grenades. Combat exercises of the ski units of the Red Army: a column of fighters on skis, in white camouflage coats, moving across the field, soldiers are carrying a Maxim machine gun on a sled. Soldiers skiing down the slope of the hill, camouflaged in the snow, soldiers are observing the terrain through binoculars. One of the fighters, hiding in the snow, monitors the positions of the conditional enemy. Soldiers at the observation post. A soldier in a white camouflage robe looks out of cover at the periscope. Artillery pieces, camouflaged among the trees, hit the enemy. Aircraft, incl. aircraft U-2, in the sky. Puffs of smoke from explosions. Tank movement. Ski battalions are preparing to attack a simulated enemy. A soldier lies in the snow, firing from a light machine gun. Ski units go on an attack on a simulated enemy. The machine gunner is firing. The fighter is firing from a machine gun. Explosions from exploding shells.