Actualy, it does happened, but I refused to give up Sudeten to Germany. It took me 8 tries to win the game like this. But units on mountains are really powerful in terms of defense and AI needs rework here.

All I did was sent paratroopers to Hamburg and Brits came within seconds with 25 divisions, rest is just history :D

Could you imagine if "The Fate of Czechoslovakia" happened? XD