The film tells about one of the episodes of the Great Patriotic War - the hostilities on the Musta-Tunturi isthmus between the Sredny and Rybachy peninsulas. The film uses footage of the chronicle of the Great Patriotic War, memories of war veterans - participants in the battles (synchronously). Types of Soviet fortifications during the war on the Middle Peninsula, German fortifications on the peninsula, military exercises of the Marine Corps.