Hmmmmm is there a trick to getting away if you are captured by the mercenaries and taken to their camp? Or is it a "just dont get captured" situation. If that's the case perhaps a game ended sort of situation would be good.
You should try to get your food levels up. So do work to get food from the leader or service guards to get food and water. Get your stuff back from the right side of the camp.
Once your health is fairly high you should be able to beat the camp guard with your staff fairly easily.
