The CIA's Special Activities Division (SAD) teams were the first U.S. forces to enter Iraq in July 2002, prior to the US Invasion. Once on the ground, they prepared for the subsequent arrival of US Army Special Forces to organize the Kurdish Peshmerga. In Operation Viking Hammer, this joint team (called the Northern Iraq Liaison Element (NILE)) combined to defeat Ansar al-Islam, an ally of Al Qaeda, in the North East corner of Iraq. This battle was for control of a territory that was occupied by Ansar al-Islam and was executed prior to the invasion. It was carried out by Paramilitary Operations Officers from SAD and the Army's 10th Special Forces Group. This battle was a significant defeat of a key terrorist organization and the uncovering of a chemical weapons facility at Sargat. Sargat was the only facility of its type discovered in the Iraq war.