The Front for the Liberation of Mozambique (FRELIMO) initiated a guerrilla campaign against Portuguese rule in September 1964. This conflict—along with the two others already initiated in the other Portuguese colonies of Angola and Portuguese Guinea—became part of the so-called Portuguese Colonial War (1961–1974). From a military standpoint, the Portuguese regular army maintained control of the population centres while the guerrilla forces sought to undermine their influence in rural and tribal areas in the north and west. As part of their response to FRELIMO, the Portuguese government began to pay more attention to creating favourable conditions for social development and economic growth.