Declaring a formal state of war against Uganda, Nyerere mobilized his citizen army reserves and counter-attacked, joined by Ugandan exiles united as the Uganda National Liberation Army (UNLA). The Ugandan Army retreated steadily, expending much of its energy by looting along the way. Libya's Gaddafi sent 3,000 troops to aid Amin, but the Libyans soon found themselves on the front line, while behind them Ugandan Army units were using supply trucks to carry their newly plundered wealth in the opposite direction. Tanzania and the UNLA took Kampala on 11 April 1979, and Amin fled by air, first to Libya and later to a permanent exile at Jeddah, Saudi Arabia. Though pro-Amin forces were left scattered and disjointed by the seizure of the capital, combat operations in the country continued until 3 June, when Tanzanian forces reached the Sudanese border and eliminated the last resistance.