@fallen189: I don't remember ever fighting 9 at a time when i fought them, which was for the best because i think i was underleveled, maybe you're activating them in place which puts you at a disadvantage.
I went up a hill to the left of the overturned cart and the ended up doing what damage i could, and then midnight oiled and flared to block off the majority of the battle field, the fire on the ground blocks sight lines, which tbh sometimes i find more annoying than helpful, but it will keep you alive longer. I think the majority of the troops are ranged so when you block their vision they become useless, don't think they move much either. For the melee troops if you block the path to you they will go all the way around to avoid walking on fire and try to come up the way you originally came, which when they come close enough you can block with fire or just kill them, summons are useful.
When you fight large groups damage really isn't the best thing to go for, it's often more about disabling as many enemies from hurting you and targeting those who can. If you haven't got it get teleport, it works wonders on skeletons and well everything really.
And if you're in a bind the man at arms skill "cure wounds" is basically an instant kill when used on zombies, it has a ridiculous cooldown though so it's really a once a fight ability, hopefully i'm talking about the right fight haha