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DO NOT USEOn The Scene: Cracking The Enemy

IRAQ: Lt. Matt Fennell of Los Altos, Calif, mans the turret of a Marine AAV as Alpha Company, 1st Battalion, Regimental Combat Team 5, heads north past a Iraqi traffic sign towards Baghdad, Monday afternoon, March 31, 2003.
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CBS News Correspondent John Roberts is traveling with the U.S. Marines in southern Iraq.

Marines move out to capture an airport near the Iraqi town of Al-Hayya. They spot armor, trucks and other vehicles and call in cobra gunships.

The light armored vehicles take their turn in the town of Al-Hayya, firing on Iraqi positions that earlier air strikes have failed to dislodge.

It is a large town and the Iraqi military presence here was substantial, but the resistance the Marines encounter was far less than they have seen up to now.

"Seems like the enemy are pretty overwhelmed as we came in and it seems like they were trying to pull out," says Capt. Ivan Monclova.

Al-Hayya was all that stood between these marines and the city of al-Kut where the Baghdad division of Saddam Hussein's elite republican guard has been holed up for weeks. But there are signs, commanders say, that after days of intensive American bombing, the Baghdad division may be beginning to crack.

"We're starting to see a lot more deserters, we're starting to see people take off their uniforms and put on civilian clothes," says Lt. Col. Eddie Ray.

American commanders are still preparing for the worst. They believe, despite the absence of biological and chemical weapons on the battlefield so far, Saddam will order his generals to use them at some point in the U.S. advance.

"I think the red line is in the head of the regime. When he decides that it's all over for him, perhaps that will be the trigger for him to use chemical weapons," says Brig. Gen. John Kelly.

American commanders claim Saddam has so far held back using those weapons in an attempt to win the propoganda war. They will find out soon enough.