T.A. by this time the red army had more then 500 divisions consisting of more then 6.2 million men, not 300-400 divisions.
If the beaten and the demoralized Germans caused so much trouble for the Allies at the battle of the Bulge, with no fuel and little air support and several hundred tanks, how might the Allies due against an experienced, well motivated and well led Red army which suffered from neither air support nor fuel and instead of hundreds of tanks rolled in with several thousands?
Also the Allies had a much longer supply line then the Soviets in Europe
