>> they are incredibly difficult to stop as well. these are -- at times, bulldozers, armored, packed with explosives, something out of a "mad max" movie. going towards the front lines. blowing up, creating chaos, isis exploits that and is able to take advantage. they are very difficult to stop, the united states government is sending anti-tank missiles to the iraqi government to help stop this tactic. but it has proven very effective. and one thing it highlights, more than anything is isis' will to continue the battle to keep pushing. it shows that on the other side when they fight the iraqi government, they just, their soldiers do not have that will to hold the ground, even though they are facing -- a very -- capable force. ian lee, live from cairo. thank you for explaining this, ian. good talking to you. one of the richest new prizes claimed by isis is the ancient