Well, not exactly. Each camp has a Legate, sort of a mini-boss (if he can indeed be called that, they are a bit weaker). And these Legates cannot be killed, they just go on their knee and get back up, no matter how much damage or how many times it's done.
This is really immersion breaking for me. I thought for a game that included freakin sieges of cities I would be allowed to clear out and kill everyone in the enemy camps, but no. There's always that one little bastard that won't die.
Is there a reason for this? is there a work-around? it really bothers me.