By the beginning of December 1941, German troops were within sight of the Kremlin. The Panzers of Fedor von Bock seemed poised to capture the capital ot the Soviet Union and complete the triumph of Operation Barbarossa. But they had reckoned without the heroic resistance of the Russian people and the nerve of Georgi Zhukov. As ferocious conditions slowed their advance, the Germans were struck and hurled back by fresh Red Army divisions which had been brought up secretly for a surpise offensive. Rarely-seen archive film and four-colour graphics bring alive one of the most critical moments of World War 2.