Bill Roggio explains what happened with the Iraqi assault on the Mahdi army in Basrah:
Eleven days after Prime Minister Nouri al Maliki launched Operation Knights' Assault in Basrah, the picture of the fighting in the city has become clearer. Maliki launched the operation after giving limited notice to Multinational Forces Iraq, and an inexperienced Iraqi Army brigade from the newly formed 14th Division cracked during the opening days of the fighting. The Iraqi Army [then] rushed forces into Basrah, including Army and elite police units, to stabilize the fighting, and six days after the operation began, Muqtada al Sadr ordered his Mahdi Army to stand down in Basrah, Baghdad, and the South.
There's much more here.
RLC