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Rwandan Patriotic Front's military campaign and victory

On 7 April, as the genocide started, RPF commander Paul Kagame warned the crisis committee and UNAMIR that he would resume the civil war if the killing did not stop. The next day, Rwandan government forces attacked the national parliament building from several directions, but RPF troops stationed there successfully fought back. The RPF then began an attack from the north on three fronts, seeking to link up quickly with the isolated troops in Kigali. Kagame refused to talk to the interim government, believing that it was just a cover for Bagosora's rule and not committed to ending the genocide. Over the next few days, the RPF advanced steadily south, capturing Gabiro and large areas of the countryside to the north and east of Kigali. They avoided attacking the capital city Kigali or Byumba, but conducted manoeuvres designed to encircle the cities and cut off supply routes. The RPF also allowed Tutsi refugees from Uganda to settle behind the front line in the RPF controlled areas.

Throughout April, there were numerous attempts by UNAMIR to establish a ceasefire, but Kagame insisted each time that the RPF would not stop fighting unless the killings stopped. In late April, the RPF secured the whole of the Tanzanian border area and began to move west from Kibungo, to the south of Kigali. They encountered little resistance, except around Kigali and Ruhengeri. By 16 May, they had cut the road between Kigali and Gitarama, the temporary home of the interim government, and by 13 June, had taken Gitarama itself, following an unsuccessful attempt by the Rwandan government forces to reopen the road; the interim government was forced to relocate to Gisenyi in the far north west. As well as fighting the war, Kagame was recruiting heavily to expand the army. The new recruits included Tutsi survivors of the genocide and refugees from Burundi, but were less well trained and disciplined than the earlier recruits.

Having completed the encirclement of Kigali, the RPF spent the latter half of June fighting for the city itself. The government forces had superior manpower and weapons, but the RPF steadily gained territory as well as conducting raids to rescue civilians from behind enemy lines. According to Dallaire, this success was due to Kagame's being a "master of psychological warfare"; he exploited the fact that the government forces were concentrating on the genocide rather than the fight for Kigali, and capitalised on the government's loss of morale as it lost territory. The RPF finally defeated the Rwandan government forces in Kigali on 4 July, and on 18 July took Gisenyi and the rest of the northwest, forcing the interim government to flee into Zaire and finally ending the genocide. At the end of July 1994, Kagame's forces held the whole of Rwanda except for the zone in the south-west which had been occupied by a French-led United Nations force as part of Opération Turquoise.

The Liberation Day for Rwanda would come to be marked as 4 July and is commemorated as a public holiday.