Too many ppl died fighting runts army?

Anyone have this same problem or know how to pass?

Man all I did was let the soldiers basically handle everything while I went behind and stabbed whoever I could without getting hit. I was basically just saving my HP for the fight with Runt

When you started the mission did you tell Radzig thatthere are alot of people in the camp ? If you did he will call people from Talmberg and Rattay and there will be much mire people if not he will just call a few from Talmberg