The northern campaign against the Kai Colo in the highlands was similar but involved removing the rebels from large, well protected caves in the region. Knollys managed to clear the caves "after some considerable time and large expenditure of ammunition". The occupants of these caves included whole communities, and as a result many men, women and children were either killed or wounded in these operations. The rest were taken prisoner and sent to the towns on the northern coast. The chief medical officer in British Fiji, William MacGregor, also took part both in killing Kai Colo and tending to their wounded. After the caves were taken, the Kai Colo surrendered and their leader, Bisiki, was captured. Various trials were held, mostly at Nasaucoko under Le Hunte, and 32 men were either hanged or shot including Bisiki, who was killed trying to escape.