No army, no matter how good, can withstand the power of nature when it hits them head on. Napoleon, Hitler anybody would be taken down by a Russian winter. Yes, they should have started earlier and taken more supplies with them, but they did not know what to expect. A freezing climate such as Russia's in winter will freeze the diesel and oil in machinery and kill men. The only way forward there was to air bomb in front and run your way through the defences on the ground that way to give the army chance to bed down for the bad weather. Lessons were learnt, and even a modern army would think twice before trying it. And Stalin, why don't you post your personal details? Are you afraid we'll realise something about you?