The Assiniboine became reliable and important trading partners and middlemen for fur traders and other Indians, particularly the British Hudson's Bay Company and North West Company, operating in western Canada in a vast area known then as Rupert's Land. During the later 18th century and early 19th century, south of the border in what became Montana and the Dakota territories, the Assiniboine traded with the American Fur Company and the competing Rocky Mountain Fur Company. The Assiniboine obtained guns, ammunition, metal tomahawks, metal pots, wool blankets, wool coats, wool leggings, and glass beads, as well as other goods from the fur traders in exchange for furs. Beaver furs and bison hides were the most commonly traded furs.