Leningrad region. Tactical exercises of the troops of the Leningrad Special Military District. The exercise is attended by the People's Commissar of Defense of the USSR, Marshal of the Soviet Union S.K. Timoshenko. Infantry, tank, artillery units during exercises. Explosions in the field. A signalman at the phone in the trench. SK Timoshenko talks with the soldiers. Analysis of the exercises after their completion.