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tion across the Rocky Mountains, the American Fur Company is obliged constantly to keep at that post a garrison of sixty or seventy men.

Under the general name of Blackfeet are comprehended several tribes: such as the Surcies, the Peagans, the Blood Indians, and the Gros Ventres of the Prairies: who roam about the southern branches of the Yellowstone and Missouri Rivers, together with some other tribes further north.

The bands infesting the Wind River Mountains, and the country adjacent, at the time of which we are treating, were Gros Ventres of the Prairies, which are not to be confounded with Gros Ventres of the Missouri, who keep about the lower part of that river, and are friendly to the white men.

This hostile band keeps about the head waters of the Missouri, and numbers about nine hundred fighting men. Once in the course of two or three years they abandon their usual abodes, and make a visit to the Arapahoes of the Arkansas. Their route lies either through the Crow country, and the Black Hills, or through the lands of the Nez Percés, Flatheads, Bannacks, and Shoshonies. As they enjoy their favorite state of hostility with all these tribes, their expeditions are prone to be conducted in the most lawless and predatory style; nor do they hesitate to extend their maraudings to any party of white men they meet with; following their trails; hovering about their camps; waylaying and dodging the caravans of the free traders, and murdering the solitary trapper. The consequences are frequent and desperate fights between them and the "mountaineers," in the wild defiles and fastnesses of the Rocky Mountains.

The band in question was, at this time, on their way homeward from one of their customary visits to the Arapahoes; and in the ensuing chapter we shall treat of some bloody encounters between them and the trappers, which had taken place just before the arrival of Captain Bonneville among the mountains.