Well first you have to sue your own startegy , but I'll tell you how you can beat it easier, like the units and stuff. Personally I would use Orcs of the North and get Battle Axeman. Lvl up your axe skill, armor, and speed voer and over, and that's pretty much it, if it doesn;t hepl, I'm sry.
ya I don't like the mountain trolls unless you get giants and charge with them then put tons of scouts behind them, that's like the only way to win with them.