On 31 July 2004, the 11th Marine Expeditionary Unit, under the Polish-led Multinational Division Central-South (MND-CS), assumed operational control of An Najaf and Al-Qadisiyyah provinces from Task Force Dragon, which was composed of elements of the 1st Infantry Division. Task Force Dragon had earlier (June 2004) relieved the 2nd Armored Cavalry Regiment who had been extended twice in Iraq. A platoon from the 66th Military Police company had been in Najaf since March and was one of the only American units in Najaf before this time. The platoon was working with the Iraqi Police to rebuild and train the police force in this area and was under siege along with soldiers from the El Salvadorian Army until the 2nd Armored Cavalry Regiment arrived.