During the civil war between 1980 and 1992 the Salvadoran military and the main opposition group, the "Frente Farabundo Martí de Liberación National" (FMLN)"," recruited children extensively. The recruitment was frequently carried out by force and focused on economically suppressed regions. A fifth of the army's personnel were aged under 18, as were a quarter of the FMLN. In a group of 278 former FMLN child soldiers interviewed for a study, the average age of recruitment was 10 years. The large majority of child recruits on both sides were living in poverty, and had been largely deprived of formal education. Many children who were not recruited by force joined of their own volition, mainly either to improve their circumstances or because they believed in the cause.