Shoshonees, when pursued by their enemies on horseback." Another similar work was encountered the next day. (Lewis and Clark, (1), II, pp. 379-380.) BUREAU OF AMERICAN ETHNOLOGY BULLETIN 77 PLATE 16 [Illustration: _a._ Blackfoot camp. Paul Kane, 1848] [Illustration: _b._ Arapaho village, Whitewood Canyon, Wyoming, about 1870] BUREAU OF AMERICAN ETHNOLOGY BULLETIN 77 PLATE 17 [Illustration: "CAMP OF THE GROS VENTRES OF THE PRAIRIES" ON THE UPPER MISSOURI Karl Bodmer, 1833] The preceding references to fortified camps are of great interest, but similar works were mentioned by other explorers of the upper Missouri Valley. During the summer of 1833 several were encountered by Maximilian, and on July 18 of that year he wrote: "On this day at noon, we reached, on the south bank, an Indian fort ... it is a kind of breastwork, which Indian war-parties construct in haste of dry trunks of trees.... This fort consisted of a fence, and several angles, enclosing a rather small space, with the open side towards the river. In the center of the space there was a conical hut, composed of wood. Near this fort, on the same bank of the river, there was a beaver's den made of a heap of brushwood." (Maximilian, (1), p. 216.) Six days before, on July 12, they had encountered several huts probably similar to that which stood within the "fort." In the narrative it is said: "Just at the place where our vessel lay, were four old Indian huts, of some war or hunting party, composed of trunks and boughs of trees piled together in a square, in which some of our party made a fire to cook their meat. Scarcely 100 paces above these huts, was the Indian Fort Creek of Lewis and Clark." (Op. cit., p. 212.) Elsewhere in this sketch other native "forts" will be mentioned. The erection of such works appears to have been quite common among the widely scattered tribes.