In February 1981, shortly after the new Obote government took office, with Paulo Muwanga as vice president and minister of defense, a former Military Commission member, Yoweri Museveni, and his armed supporters declared themselves the National Resistance Army (NRA). Museveni vowed to overthrow Obote by means of a popular rebellion, and what became known as "the war in the bush" began. Several other underground groups also emerged to attempt to sabotage the new regime, but they were eventually crushed. Museveni, who had guerilla war experience with the Front for the Liberation of Mozambique (Frente de Libertaçâo de Moçambique—Frelimo), campaigned in rural areas hostile to Obote's government, especially central and western Buganda and the western regions of Ankole and Bunyoro.