From The Oregon Trail: Sketches of Prairie and Rocky-Mountain Life, by Francis Parkman (E-Bookarama, 2020), Kindle pp. 89-90:
As the Indian approached we stopped to wait for him, when suddenly he vanished, sinking, as it were, into the earth. He had come upon one of the deep ravines that everywhere intersect these prairies. In an instant the rough head of his horse stretched upward from the edge and the rider and steed came scrambling out, and hounded up to us; a sudden jerk of the rein brought the wild panting horse to a full stop. Then followed the needful formality of shaking hands. I forget our visitor’s name. He was a young fellow, of no note in his nation; yet in his person and equipments he was a good specimen of a Dakota warrior in his ordinary traveling dress. Like most of his people, he was nearly six feet high; lithely and gracefully, yet strongly proportioned; and with a skin singularly clear and delicate. He wore no paint; his head was bare; and his long hair was gathered in a clump behind, to the top of which was attached transversely, both by way of ornament and of talisman, the mystic whistle, made of the wingbone of the war eagle, and endowed with various magic virtues. From the back of his head descended a line of glittering brass plates, tapering from the size of a doubloon to that of a half-dime, a cumbrous ornament, in high vogue among the Dakotas, and for which they pay the traders a most extravagant price; his chest and arms were naked, the buffalo robe, worn over them when at rest, had fallen about his waist, and was confined there by a belt. This, with the gay moccasins on his feet, completed his attire. For arms he carried a quiver of dogskin at his back, and a rude but powerful bow in his hand. His horse had no bridle; a cord of hair, lashed around his jaw, served in place of one. The saddle was of most singular construction; it was made of wood covered with raw hide, and both pommel and cantle rose perpendicularly full eighteen inches, so that the warrior was wedged firmly in his seat, whence nothing could dislodge him but the bursting of the girths.