In the depths of the Russian winter, the War turned and the invading forces found themselves overrun. Only a few weeks before the Germans had been within sight of Moscow. Now, in December 1941 in sub-zero temperatures on the Eastern front, the Sixth Panzer Division reported a strength of just 350 riflemen and no tanks. “There were no reserves. All leave was cancelled,” write Brendan Simms and Charlie Laderman in Hitler’s American Gamble: Pearl Harbour and the German March to Global War.