Evacuate it. Let them take it. And as they dance in the street and raise their flag, pulverize it.
That's why God invented trip wires, claymores, wood or plastic mines, minature drones and RFID dust.
Every artillery and missle should be sited in to the roads from Qlaya, all the mountain roads in Rafel El Mernaba, and every moving vehicle or group of men south of a line from Tyre-Nabateih with fields of fire and thousands of rounds of shells/missles squirreld away.