Funny how that didn't prove to be true in the least in Iwo Jima, Peleliu or Okinawa.
They were like a fox in a hole. Simply minimize ground force exposure, drawing them out when possible, otherwise wait them out.
You can always dig out the old Roman methods of siege, i.e., burn them out from the air, etc., if you want to speed things up a bit.
They have already lost, it’s only a matter of time.
There is no sense at all to wasting lives in the process of clearing them out, seeing as how they have arrived at checkmate. They have no resupply, they have no navy, etc. The fat lady is singing at that point.
GMTA, I hadn’t read your post before I did mine. Three excellent example that stand in the face of sweeping generalizations.