 In April 1979, Idi Amin Dada was toppled from power by the Tanzania People's Defence Force (TPDF) and the Uganda National Liberation Army (UNLA).Idi Amin was a native son of the West Nile sub-region and many of the soldiers in his army came from this region too.As the victorious UNLA soldiers marched northwards to Arua, civilians, and former Amin soldiers took refugee in the compound of the Catholic mission and St. Joseph's College Ombaci, both of which were surrounded by a common perimeter fence.