The possibility of foreign intervention prompted the central government to request military assistance from southern Sulawesi. The Permesta forces were later removed from Central Sulawesi, Gorontalo, Sangir, and Morotai in Maluku. Permesta planes (supplied by the US and flown by Philippine, Taiwanese, and American Pilots) were destroyed. The US then moved on, and in June 1958 the central government army landed in Minahasa. The Permesta uprising ended in mid-1961.