Russia was by far the nation who had the biggest impact on the Nazi's losing WWII.
If ze Germans did their history about Napoleon and invading russia in the fucking winter, and like, didnt, there was no way normandy was remotely possible.
They didn't invade Russia in the winter, it's a myth.
The plan was to invade Russia in May, but due to floods and Germany helping out Italy in the Balkan campaign it was delayed.
Germany launched Operation Barbarossa in June 1941, and they planned that the whole campaign would be over before Christmas.
Sure the harsh winter was one of the factors why Nazi Germany lost in Russia, but there were so many other reasons well.
Muddy roads, bad decisions by Hitler/his generals, partisan attacks, Soviet courage, the shortage of German supplies, and Stalin freeing up Siberian soldiers from the Soviet far east and sending them all out attack on the tired Germans were all very important factors.
Napoloen didn't invade Russia in the winter either, he launched his campaign 24th June (Hitler launched his 22nd June).
You know who did invade Russia in the winter? The mongols. And they ripped Russia in two. The Poles also invaded Russia successfully in the winter, so did the Japanese.
Enough history for today folks.