Indonesia–Malaysia confrontation party which was founded in June 1959. The Sarawak Insurgency began after the Brunei Revolt in 1962 and SCO would fight alongside the Bruneian rebels and Indonesian forces during the Indonesia–Malaysia confrontation (1963–1966). The Sarawak Communist Organisation and the Bruneian rebels supported and propagated the unification of all British Borneo territories to form an independent leftist North Kalimantan state. This idea was originally proposed by A. M. Azahari, leader of the Parti Rakyat Brunei (Brunei People's Party), who had forged links with Sukarno's nationalist movement, together with Ahmad Zaidi, in Java in the 1940s. However, the Brunei People's Party was
Brunei revolt form Malaysia, Indonesia became actively involved in subterfuge operations and later declared war on Malaysia. During this period, Indonesian agents came into contact with local opposition that was against the idea of a federation. The rebellion broke out at 2:00 am on 8 December. Signals from Brunei to British Far East Headquarters reported rebel attacks on police stations, the Sultan’s Istana, the Prime Minister’s house and the power station, and that another rebel force was approaching the capital by water. Far East Headquarters ordered ALE YELLOW, which placed a force of two Gurkha infantry companies on 48 hours notice to