From this all too brief account of the Mandan it is quite evident that when they were first encountered by the French, living in their earth lodges, their villages strongly palisaded, their caches filled with corn and other food supplies, buffalo robes and bear skins, they were in their most powerful and prosperous state. But what great changes they were destined to undergo during the next hundred years!
On October 19, 1804, the Lewis and Clark party discovered the first of the ruined villages of the Mandan, evidently standing on the left bank of the Missouri, in the southern part of the present Burleigh County, North Dakota. It proved an interesting day. "In walking along the shore we counted fifty-two herds of buffaloe and three of elk, at a single view. Besides these we also observed elk, deer, pelicans, and wolves." The ruined village had been protected by palisades and, according to the Arikara chief, who accompanied them, had been occupied by the Mandan. These, so they wrote, "are the first ruins which we have seen of that nation in ascending the Missouri." During the night of October 19 the expedition encamped on the south, i. e., right, bank of the Missouri, evidently about 2 miles below the mouth of Little Heart River, which flows from the westward and joins the Missouri in the present Morton County, North Dakota. The following day they advanced 12 miles up the Missouri.
October 21, 1804, was cold and bleak. Snow and ice covered the ground, and the wind blew strong from the northeast. That day the expedition advanced only 7 miles. They passed the mouth of Big Heart River and the site of Bismarck, the present capital of the State. Two miles above their camp of the night previous, about opposite the mouth of the Big Heart, they reached "the ruins of a second Mandan village, which was in existence at the same time with that just mentioned. It is situated on the north at the foot of a hill in a beautiful and extensive plain, which is now covered with herds of buffaloes; nearly opposite are remains of a third village on the south of the Missouri, and there is another also about two miles further on the north, a little off the river. At the distance of seven miles we encamped on the south, and spent a cold night." The next day, October 22, they discovered other ruined towns of the Mandan. "In the morning we passed an old Mandan village on the south, near our camp; at four miles another on the same side.... At six we reached an island about one mile in length, at the head of which is a Mandan village on the north in ruins, and two miles beyond a bad sandbar. At eight miles are remains of another Mandan village on the south; and at twelve miles encamped on the south.... These villages, which are nine in number, are scattered along each side of the river within a space of twenty miles; almost all that remains of them is the wall which surrounds them, the fallen heaps of earth which covered the houses, and occasionally human skulls and the teeth and bones of men, and different animals, which are scattered on the surface of the ground." (Lewis and Clark, (1), I, pp. 112-114.) Other deserted villages were passed as they continued ascending the Missouri, to arrive late on the 26th of October, at an old field of the Mandan, about one-half mile below the first of their then occupied villages.