1 plot. -Girls-Red Navy men of the Amur Flotilla serve sound-detecting and searchlight installations located at the anti-aircraft units of the Red Army on the Far Eastern border of the USSR. 2 plot. - Stalingrad front. Regiment commander's observation post. The regiment commander, Lieutenant Colonel V.N. Yurgelevich, is monitoring the enemy position and giving orders by radio. The regiment commissar, Hero of the Soviet Union V.N. Yakovlev gives the order to the soldier to restore the broken communication. A fighter under fire restores the broken connection.