@peter jeffrey cobb,
On 23 February 1991, the 1st Marine Division, 2nd Marine Division, and the 1st Light Armored Infantry crossed into Kuwait and headed toward Kuwait City.
The first units to move into Iraq were three patrols of the B squadron of the British Special Air Service, call signs Bravo One Zero, Bravo Two Zero, and Bravo Three Zero, in late January.
Elements of the 2nd Brigade, 1st Cavalry Division of the U.S. Army performed a covert Reconnaissance into Iraq on 9 February 1991, followed by one in force on 20 February that destroyed an Iraqi regiment.