The Red Army marched on foot and hauled its weapons and supplies on carts powered by draught animals; its soldiers were granted no leave and, if they hesitated, no quarter: 157,593 of them had been executed for ‘cowardice’ in 1941 and 1942 alone. But after a halting start, the USSR had out-produced and out-fought the Nazi colossus, ripping the heart from the magnificent German military machine. For its friends and foes alike, the Soviet victory in World War Two bore witness to the Bolsheviks’ achievement. Stalin’s policies were vindicated, his pre-war crimes largely forgotten.