I can beat these boxing them but I was wondering if anyone has some good hints on easy ways to do these. What I was doing on Dain 3 at least was actually using Dain (risky I know as if he dies mission is lost) and a warrior and the two clerics. I would pull the giants back to main coldain camp and never move any of the coldain. Alternate heals on Dain to keep him alive (clerics from camp will heal him too) and assist with my other warrior. Seemed to work ok as I had a lot of the coldain left at the end. Would appreciate it if anyone has any easy ways to do this. 
Eqisdead
Eqisdead