Tonight... Get on On the Record with Greta!

American troops advancing toward Baghdad engaged in fierce street-to-street battles with Iraqi militants Tuesday -- as a few U.S. military units crossed into the "red zone" within 50 miles of the capital.

U.S. Marines waged a firefight against Iraqi forces around Diwaniyah, 75 miles southeast of Baghdad, and reportedly took at least 20 prisoners.

Fox News' Rick Leventhal, embedded with Marines about 75 miles south of Baghdad, reported that U.S. troops will destroy two Iraqi Al-Samoud 2 missiles they found covered by a tarp on a flatbed truck.

The Al-Samouds are surface-to-surface missiles capable of carrying chemical munitions, although no chemical weapons were found. Iraq, under orders from U.N. weapons inspectors, was slowly destroying its Al-Samouds before the war began.

We’ll have the latest on the war plus expert reaction from our military experts: retired Marine Col. John Garrett, former U.S. Navy Captain Chuck Nash and retired U.S. Army Col. David Hunt.

Also, we'll have additional reports from the Middle East and Washington, D.C. from our correspondents in the field.

Then, are Iraqi civilians shedding their reluctance to assist the forces fighting against Saddam Hussein? We'll talk with two Iraqi insiders.

Later, how's the war playing on the domestic front? We'll ask former Senate Majority Leader George Mitchell.

Finally, we'll talk with former U.S. Ambassador to the United Nations and current New Mexico Governor Bill Richardson about the state of the war and the shape of world opinion.

Don't miss On the Record with Greta Van Susteren LIVE at 10 p.m. ET! 

--The Associated Press contributed to this report.

--All topics and guests are subject to change.

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