The importance of the Kwantlen to the British settlement at Fort Langley became evident when Hudson's Bay Company men at the Fort joined Kwantlen warriors in repelling an attack by the Euclataws of Quadra Island - the victory of combined Kwantlen and British forces helped bring an end to slave raids on the lower Fraser by northern tribes, and is the only time British and Indigenous forces fought side by side in British Columbia. Kwantlen lost power after the formation of the colony of British Columbia. Their power was diminished further after British Columbia joined Canada, and the colonizing government took control and assigned their affairs to the administration of an Indian Agent  This agent was appointed by the government in Ottawa.
The Kwantlen played a crucial role at Fort Langley when they joined forces with Hudson's Bay Company personnel to repel an attack from the Euclataws on Quadra Island - this victory helped end slave raids on the lower Fraser. The Kwantlen's power diminished after British Columbia became a colony and later part of Canada, leading to their affairs being managed by an Indian Agent appointed by Ottawa.