They're cut off everywhere.
The ONLY place they have to go is Mosul. And the battle for Mosul will rival the battle of Okinawa.
I can envision 50,000 artillery rounds falling on Mosul, along with 20,000 rockets.
It's the only answer.
I’d throw in a tactical nuke just to make it interesting.
Koniev and Zhukov, facing Seelowe Heights.
“And the battle for Mosul will rival the battle of Okinawa. “
I haven’t seen anything in ISIS that matches the quality, discipline, and fanaticism of the Japanese soldier circa WWII. Isis mainly has an outsized reputation based upon extreme cruelty to helpless people. I cannot think of a fight with any normal military where their military prowess was on display. they are little more than a street gang running a city.