a train of pack horses used in transporting furs and trading goods, especially in the Rockies.
1908  It became apparent that it would be cheaper for the Hudson's Bay Company to ship some of its New Caledonia furs by sea south to the Columbia than to send the packs inland and south by the horse brigades.
1953  The era of the horse brigades came to an end with the building of the Cariboo Road up the Fraser Canyon and onto the gold mines of the interior. . . .