On any corner of Mosul, chaos can come any second, CBS News correspondent Mark Strassmann reports. In video, a U.S. patrol is attacked, in a city that's under fire.
Video of the firefight, obtained exclusively by CBS News, was recorded by a camera mounted on a U.S. soldier's helmet.
American big guns arrive. Attack helicopters and Bradley fighting vehicles.
Mosul has become "insurgent central" in Iraq - al-Qaeda's base of money and foreign fighters.