In February 1958, dissatisfaction with the centralist and communist-leaning policies of the Sukarno administration triggered a revolt which was centred in the Minangkabau region of Sumatra, with rebels proclaiming the Revolutionary Government of the Republic of Indonesia (PRRI) in Bukittinggi. The Indonesian military invaded West Sumatra in April 1958 and had recaptured major towns within the next month. A period of guerrilla warfare ensued, but most rebels had surrendered by August 1961. In the years following, West Sumatra was like an occupied territory with Javanese officials occupying most senior civilian, military and police positions. The policies of centralisation continued under the Suharto regime. The national government legislated to apply the Javanese "desa" village system throughout Indonesia, and in 1983 the traditional Minangkabau "nagari" village units were split into smaller "jorong" units, thereby destroying the traditional village social and cultural institutions. In the years following the downfall of the Suharto regime decentralisation policies were implemented, giving more autonomy to provinces, thereby allowing West Sumatra to reinstitute the "nagari" system.