Prior to the US 2003 invasion of Iraq, Special Activities Division (SAD) and the Army's 10th Special Forces Group entered Iraq and cooperated with Patriotic Union of Kurdistan Peshmerga to attack Ansar al-Islam. Together they launched Operation Viking Hammer in March 2003 which dealt a huge blow to the terrorist group which resulted in the deaths of a substantial number of terrorists and the uncovering of a chemical weapons facility at Sargat. Sargat was the only facility of its type discovered in Iraq.