Originally the 1st Division was one of the four initial divisions of the Iraqi Army, active by 1941. It later became the 1st Mechanised Division, and in 1978, according to reports from the British Military Attache in Baghdad, formed part of the 3rd Corps, and was headquartered at Diwaniya, with the 1st (Diwaniya), 34th (Nasirya) and 27th Brigades (Kut). It fought in the Iran–Iraq War, including Operation Fath ol-Mobin, in which the division suffered heavy losses, and at the Second Battle of Al Faw. It was in Kuwait during the 1991 Gulf War, fought during the Battle of Khafji, and was active during the 1990s. At the beginning of the 2003 invasion of Iraq it was part of the 5th Corps in the Mosul area. It was disbanded with the rest of the Iraqi Army in May 2003.