During August 2004, the MEU, led an assault consisting of 1st Battalion, 4th Marines; 1st Battalion, 5th Cavalry Regiment, 1st Cavalry Division; and 2nd Battalion, 7th Cavalry Regiment, 1st Cavalry Division, against the Islamist Mahdi Army of Muqtada al-Sadr in Najaf.
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Crook's force composed of 130 troopers from the 5th Cavalry Regiment led by Captain William H. Brown and another thirty Apache Scouts.
Soldiers from the 1st Brigade, 1st Cavalry Division including 1st battalion 12th Cavalry Regiment and 2nd Battalion, 5th Cavalry Regiment were stationed at Camp War Eagle and fought against the shia Militia of Muqtada al Sadr known as the Mahdi Army during the uprising which began April 4, 2004.
Task Force Lancer consisted primarily of the 2nd Battalion, 5th Cavalry Regiment from the 1st Brigade, 1st Cavalry Division under the command of Colonel Robert B. Abrams.