Idi Amin of Amin's ministers defected or fled into exile. In November 1978, after Amin's vice president, General Mustafa Adrisi, was injured in a car crash, troops loyal to him mutinied. Amin sent troops against the mutineers, some of whom had fled across the Tanzanian border. Amin accused Tanzanian President Julius Nyerere of waging war against Uganda, ordered the invasion of Tanzanian territory, and formally annexed a section of the Kagera Region across the boundary. In January 1979, Nyerere mobilised the Tanzania People's Defence Force and counterattacked, joined by several groups of Ugandan exiles who had united as the Uganda National Liberation
Idi Amin estimated by international observers and human rights groups to range from 100,000 to 500,000. Amin did not write an autobiography, and he did not authorize an official written account of his life. There are, therefore, discrepancies regarding when and where he was born. Most biographical sources claim that he was born in either Koboko or Kampala around 1925. Other unconfirmed sources state Amin's year of birth from as early as 1923 to as late as 1928. Amin's son Hussein has stated that his father was born in Kampala in 1928. According to Fred Guweddeko, a researcher at Makerere University, Amin