Not sure how effective your erebor dwarf list is.
I know Thorin is a big deal to kill goblins, but youre largely outnumbered and grimhammers not that good, they <are decent lets say, but the options of the weapon fight style only benefits greatly if you want to tag in thorin i na fight, and he can´t be everywhere, the goblins o nthe other hand their special attacks dont actually makes them worst, they got a puny defence and fight value, so they will always use the weapons special skills, which in case they win + numbers will certaintly maul even the sturdiest grim hammer :/
My recommendation is to, or give a character that totally rocks and hes really really hard to kill and can chew through ranks or simply invest on cheaper ones to balance even more for your side.
If I wanted to make some war on this, maybe getting hmmm
Some thorin´s company dwarves, some are cheap and get usefull skills, and maybe another warband just regular dwarf warriors or dwalin.
If I was just for dwarves well.... expensive but the kings champion is hard as a rock to break even for puny goblins would chunk a large problem to handle him and his heralds.
