Enemy dominion too high for me?

[brxbrx]

Do you have access to inquisitor? That could tip it for you. An inquisitor profit can turn things around. You can also give him the Sword of Injustice, the Sword of Justice, or maybe the ark. Or the stone idol.
Or bring in a bunch of Juggernaughts.

[Knai]

If you take a few provinces past this one, you'll be better able to destroy it. Until then, anything that reduces the dominion in general can work. A scout of some sort with a stone idol equipped could get a start on this, then move into enemy dominion and weaken it from other, possibly enemy, provinces.