As the seat of the Bolshevik Revolution of 1917 and a centre of Soviet industry, Leningrad was a prime target of Hitler's Russian invasion. Supported by the Finns, intent on recovering territory they had lost in the Finnish-Soviet Winter war the previous year, Nazi forces rapidly broke through the city's lines of defence, many cobbled together by its civilian population. This film - which features rarely seen archive footage now digitally restored - explores the Siege of Leningrad, which lasted