Cast invisiblity on your thieve then sneak him or her up and disable the traps. Then scoot your thief on around to the other side of the skeletons. Once your thief is out of range of the blast area throw a few potions of Oil of Fiery burning at them to weaken them up. Then rush everyone at them. Always works for me.
------------------
Sir Taliesin
If they take my gun can I still use my Axe?