btw, do you know why the Mongols so badly wanted to attack the Magyars?
I was reading about their attack on Poland and that was just a diversion -- their real target were the Magyar and I dont know why
Not a problem. The Mongols rolled through Central Asia, the Altai and such, without even slowing down.
Central Asian mountains make those of Europe look itty-bitty.
They would have been somewhat impeded by the forests of western Europe, but had they been intent on conquest I don't think anything would have stopped them. Except the English Channel.
What really saved Europe, of course, was distance. Given their tech, it was a LONG way from Karakorum to Rome. They had an amazing Pony Express system, but no empire could hold together over such distances, and indeed their's started coming apart almost immediately.
I have no idea why the Mongols had a bug up their butt about the Magyar. Perhaps they considered them the greatest threat as horse archers?