The Peshmerga linked up with the CIA's Special Activities Division (SAD) and the U.S. Military's 10th Special Forces Group and prepared the battle space for conventional U.S. Military forces throughout Iraq. The first step was evicting the Ansar al-Islam from their enclave around the village of Biyara. This battle happened prior to the invasion in February 2003 and was carried out with officers from SAD and the U.S. Army's 10th Special Forces Group. Most Ansar al-Islam fighters were killed during this operation, but some escaped to Iran and later regrouped in Iraq as the Ansar al-Sunnah.