"A large contingent of Iraq’s Republican Guard headed south in a convoy of at least 1,000 vehicles toward U.S. Marines in central Iraq on Wednesday — an area that already has seen the heaviest fighting of the war. The advance appeared to signal that the Republican Guard, Iraqi President Saddam Hussein’s best-trained and most loyal force, was still prepared to go on the offensive despite several days of allied airstrikes and missile attacks on its positions."
http://msnbc.com/news/870749_asp.htm?0cv=CA01
Should be interesting. Saddam's big counter-offensive in Gulf War I was a huge mistake.
Advantages: Takes advantage of (assumably still) limited air capabilities with sandstorm.
Disadvantages: Places equipment in the open away from defensive positions.