There’s one essential Law of History. It goes like this – “Don’t mess with Russia – it’s too big and has too many men and its winters are too cold.” It wasn’t just Napoleon and Hitler – King Christian of Sweden had a go even earlier – and he met with disaster, too.
P.S. - did you know that Napoleon’s men’s trouser buttons crumbled in the cold so they had to fight with one hand using a weapon and the other hand holding their trousers up ?
Obviously safety pins hadn’t been invented by then.