So, the way I see it going is:
- the tumens massacre us in the field when they can pick a fight
- if we can engage them on our terms, they are dead
- if they were steppe nomads they would probably not lose war; however, those are semi-settled nomads, with homes back in mountaints. If we attack their home, they will have to respond - and that would involve fighting us in mountains, which will be death of their cavalry
- however, they can and will murder the heck out of anything crossing plains, including supply trains to troops in mountains
So it's going to be a complicated fight: they can attack us through steppes from Salt Sea, they can attack us through Lowlands...
but they have homebases to protect, so they are easier enemy than nomads on warpath.
If we manage to win, I am for taking over enough of mountains to fort all the passes so that we don't have to fight nomads on Lowland plains.