I've seen a couple of endgame warriors do this in Stronghold, and I really want to learn how to do it, or more to the point, find out what armor I would need to pull it off.

Run out to the big room, aggro all mobs and run them back to the entrance to be aoed by the group. Same thing with the back room. Where do you pull to in the back room? that first left, then...the back corner?