YeeeeHaaaawww!! Toast 'em.
It seems that the terrorists are now staying together in larger groups to protect themselves and to hold enough power over an area.
They can't operate in groups of two or three anymore because Iraqi locals will take them out. The terrorists only hope is to have enough AK-47-touting comrades around to maintain the bully/gang posture.
This is how Fallujah, Ramadi, al Qaim and some Baghdad neighborhoods became safe havens.
This leaves the Marines with identifiable large number targets to go after which is what we are seeing now, larger operations and larger captures.