The army also concentrated on the north-western corner of Uganda, in what was then West Nile District. Bordering Sudan, West Nile had provided the ethnic base for much of Idi Amin's earlier support and had enjoyed relative prosperity under his rule. Having borne the brunt of Amin's anti-Acholi massacres in previous years, Acholi soldiers avenged themselves on inhabitants of Amin's home region, whom they blamed for their losses. In one famous incident in June 1981, Ugandan Army soldiers attacked a Catholic mission where local refugees had sought sanctuary. When the International Committee of the Red Cross (ICRC) reported a subsequent massacre, the government expelled it from Uganda.