The NYT has more info - via the UK - on the fighting.

Quote Originally Posted by New York Times
The defense secretary, Desmond Browne, also used his statement in the House of Commons to acknowledge that British military involvement in last week’s fighting in Basra was more extensive than previously disclosed.

At one point, he said, British tanks, armored vehicles, artillery and ground troops were deployed to help extract Iraqi government troops from a firefight with Shiite militiamen in the city.

Mr. Browne said British involvement in that battle was in addition to other actions in support of Iraqi forces.

He said those actions included aerial surveillance of the city; low-level missions by combat aircraft aimed at reinforcing Iraqi troops by establishing a menacing aerial presence over combat zones; the use of helicopters that carried food and ammunition to the Iraqis; and medical care for wounded Iraqi troops at British combat hospitals outside the city.

Mr. Browne said the use of British ground troops in the fighting was ordered “in extremis,” suggesting that the deployment of forces from the British base at Basra was a last-ditch measure to save Iraqi troops.