If Mr. Astor alone had held the American fur trade, there would have been none of that rivalry which ended in so much bloodshed. But St. Louis, lying like a gateway to the mountain trade, had always been jealous of those fur traders with headquarters in New York. Lisa had refused to join Mr. Astor's Pacific Company, and doubtless the Spaniard chuckled over his own wisdom when that venture failed with a loss of nearly half a million to its founder. When Lisa died the St. Louis traders still held back from the American Fur Company. Henry and Ashley and the Sublettes and Campbell and Fitzpatrick and Bridger--subsequently known as the Rocky Mountain traders--swept up the Missouri with brigades of one hundred, two hundred, and three hundred men, and were overrunning the mountains five years before the American Company's slowly extending line of forts had reached as far west as the Yellowstone. A clash was bound to ensue when these two sets of rivals met on a hunting-field which the Rocky Mountain men regarded as pre-empted by themselves. The clash came from the peculiarities of the hunting-ground. It was two thousand miles by trappers' trail from the reach of law. It was too remote from the fur posts for trappers to go down annually for supplies. Supplies were sent up by the fur companies to a mountain _rendezvous_, to Pierre's Hole under the Tetons, or Jackson's Hole farther east, or Ogden's Hole at Salt Lake, sheltered valleys with plenty of water for men and horses when hunters and traders and Indians met at the annual camp. Elsewhere the hunter had only to follow the windings of a river to be carried to his hunting-ground. Here, streams were too turbulent for canoes; and boats were abandoned for horses; and mountain cañons with sides sheer as a wall drove the trapper back from the river-bed to interminable forests, where windfall and underbrush and rockslide obstructed every foot of progress. The valley might be shut in by a blind wall which cooped the hunter up where was neither game nor food. Out of this valley, then, he must find a way for himself and his horses, noting every peak so that he might know this region again, noting especially the peaks with the black rock walls; for where the rock is black snow has not clung, and the mountain face will not change; and where snow cannot stick, a man cannot climb; and the peak is a good one for the trapper to shun.