During a standoff in one raid on a small ranching community the ranchers called a truce and offered to pay the raiders "protection money" to keep them from raiding. The raiders agreed and that became the start of a successful relationship. As the raiders had few places to spend the money they ended up spending it on equipment, food, and liquor from the ranchers, and the two groups became intermingled over the next decade as disaffected rancher sons went to join the raiders and older raiders "retired" to start ranching.About 20 years later a sickness depleted their available number of younger people, so they took again to raiding other tribes for children and teens in order to replenish their numbers. Eventually this scope broadened into slaving for laborers as well as adoptees, and slaving for profit soon followed. Now they are slave-raiders with a fixed base, despised by all others near them for their predation.
Blackfoot Tribe was "founded" by a former military group (led by a Captain John Bloch) which was left stranded after its HQ and transport vehicles were destroyed in the Great War. Skilled with weapons but lacking the knowledge of how to farm, Bloch's group fell into raiding.