At the beginning of 1966, with Indonesia's political hiatus beginning to stabilise (it had stopped a major RPKAD operation to capture a British prisoner), the RPKAD linked up with PGRS to establish guerrilla forces in Sabah and Sarawak. The Sabah effort never crossed the border; however, two groups entered Sarawak in February and May and obtained support from local sympathisers. The first group, despite losses in several contacts, lasted until June and exfiltrated on hearing about the end of Konfrontasi. Survivors of the second, after contact with Australian troops, also made it back to Indonesia. However, the final Indonesian incursion was in May and June. Signs of a substantial force were found crossing into Central Brigade. This was some 80 strong, mostly volunteers, led by Lt Sombi (or Sumbi) and a team from 600 Raider Company. They moved fast towards Brunei with 1/7 Gurkhas pursuing and ambushing them; almost all were accounted for. In response to this, a final Claret operation was launched, which was an artillery ambush by 38 Light Battery.