In the 1980s, a group of 500 Rwandan refugees in Uganda, led by Fred Rwigyema, fought with the rebel National Resistance Army (NRA) in the Ugandan Bush War, which saw Yoweri Museveni overthrow Milton Obote. These soldiers remained in the Ugandan army following Museveni's inauguration as Ugandan president, but simultaneously began planning an invasion of Rwanda through a covert network within the army's ranks. In October 1990, Rwigyema led a force of over 4,000 rebels from Uganda, advancing into Rwanda under the banner of the Rwandan Patriotic Front (RPF). Rwigyema was killed on the third day of the attack, and France and Zaire deployed forces in support of the Rwandan army, allowing them to repel the invasion. Rwigyema's deputy, Paul Kagame, took command of the RPF forces, organising a tactical retreat through Uganda to the Virunga Mountains, a rugged area of northern Rwanda. From there, he rearmed and reorganised the army, and carried out fundraising and recruitment from the Tutsi diaspora.