The Battle of Sungei Koemba (27 May – 12 June 1965) took place during the Indonesia–Malaysia confrontation. Involving Australian and Indonesian troops, the battle consisted of a series of ambushes launched by the 3rd Battalion, Royal Australian Regiment (3 RAR), along the Sungei Koemba river in Kalimantan (Indonesian Borneo). The ambushes were part of the wider Operation Claret which involved cross-border operations by British-Commonwealth units from bases in Sarawak, penetrating up to 10,000 yards (9,100 m) into Indonesian territory with the aim of disrupting the movement and resupply of Indonesian forces and to keep them off balance.