In 2006, the Islamic Courts Union (ICU), an Islamist organization, assumed control of much of the southern part of the country and promptly imposed Shari'a law. The new Transitional Federal Government (TFG), established two years earlier, sought to re-establish its authority. With the assistance of Ethiopian troops, AMISOM peacekeepers and air support by the United States, it managed to drive out the rival ICU and solidify its rule. On 8 January 2007, as the Battle of Ras Kamboni, raged, TFG President and founder Abdullahi Yusuf Ahmed, a former colonel in the Somali Army, entered Mogadishu for the first time since being elected to office. The government then relocated to Villa Somalia in Mogadishu from its interim location in Baidoa, marking the first time since the fall of the Barre regime in 1991 that the federal government controlled most of the country.