Under British rule, the Cape Colony continued to use the commando system in its frontier wars, in addition to regular British imperial troops. Boer commandos fought alongside Fengu, British settlers, Khoi-khoi and other ethnic groups in units which were often mixed. Light, mobile commandos were undeniably better-suited than the slow-moving columns of imperial troops, for warfare in the rough frontier mountains. However, tensions often arose in the Cape's government over the relative merits and control of these two parallel military systems.