In April 1979 Tanzanian forces and the Uganda National Liberation Army (UNLA), a coalition of armed rebel groups united under the Uganda National Liberation Front (UNLF), invaded Uganda and deposed the President, Idi Amin. A new UNLF government was installed, but it was weak and exercised little control over the country. This was in part due to the UNLF's and its army's own internal divisions. The several-hundred-strong Kikosi Maalum group was loyal to Milton Obote, who had served as President before Amin took power. Yoweri Museveni controlled the Front for National Salvation, which had about 3,000 members. Over time power shifted to pro-Obote elements in the government and the army. Obote assumed power in 1980 through a disputed election, and ruled through repressive methods, including the incarceration and killing of dissidents. In February 1981 Museveni and a small band of rebels began attacking UNLA forces, initiating the Ugandan Bush War. Shortly thereafter a new rebel coalition was organised as the National Resistance Movement (NRM). Museveni was made Vice-Chairman of the National Resistance Council, the group's political body, and Chairman of the High Command of the National Resistance Army (NRA), the Movement's armed organ. By July 1985 the NRA had been largely defeated and pushed out of its strongholds, and Museveni retired to Sweden.