It secured the Uganda–Sudan border in June, bringing the war to an end. In the following months, the TPDF occupied Uganda, facing only scattered resistance. Amin fled into exile while a UNLF government was established. On 10 April a combined TPDF-UNLF force attacked Kampala, and secured it the following day. Libya ended its intervention in early April and its troops fled the country. He sponsored a conference of rebels and exiles in Moshi later that month, where the Uganda National Liberation Front (UNLF) was founded. Nyerere believed that Ugandan rebels should be given time to organise their own government to succeed Amin. The loss of Lukaya led the Uganda Army to begin to collapse. In March the largest battle of the war occurred when the Tanzanians and Ugandan rebels defeated a combined Ugandan-Libyan-Palestinian force at Lukaya. The Palestinian Liberation Organisation also sent a number of guerrillas to aid Amin. While the TPDF prepared to clear the way to Kampala, the Ugandan capital, Muammar Gaddafi, the leader of Libya and an ally of Amin, dispatched several thousand troops to Uganda to assist the Uganda Army. After Amin failed to renounce his claims to Kagera and the Organisation of African Unity (OAU) failed to condemn the Ugandan invasion, the TPDF occupied the towns of Masaka and Mbarara in southern Uganda. Nyerere also mobilised Ugandan rebels loyal to Obote and Yoweri Museveni to weaken Amin's regime. On 2 November, Nyerere declared war on Uganda and mobilised the Tanzania People's Defence Force (TPDF) to retake the salient. Ugandan official media declared the annexation of the Kagera Salient. Later that month, the Uganda Army launched an invasion, looting property and killing civilians. In October 1978, Ugandan forces began making incursions into Tanzania. The circumstances surrounding the outbreak of the war are not clear, and differing accounts of the events exist. Over the following years, Amin's regime was destabilised by violent purges, economic problems, and dissatisfaction in the Uganda Army. The war was preceded by a deterioration of relations between Uganda and Tanzania following Amin's 1971 overthrow of President Milton Obote, who was close to the President of Tanzania, Julius Nyerere. The Uganda–Tanzania War, known in Tanzania as the Kagera War ( Kiswahili: Vita vya Kagera) and in Uganda as the 1979 Liberation War, was fought between Uganda and Tanzania from October 1978 until June 1979 and led to the overthrow of Ugandan President Idi Amin.

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