Throughout those first weeks the journals breathe content. Every man was abundantly pleased with his work and his lot; game was plentiful, in great variety; the difficulties to be overcome were no more than those attending the navigation of a swift and turbulent river, whose erratic channel was filled with sand-bars and dead timber. The travelers were enjoying a typical prairie season of the lower altitudes, which makes an ideal setting for outdoor life. Here and there they came in contact with friendly bands of Indians; occasionally they encountered boats upon the river, manned by traders, who were drifting with the current to St. Louis, bearing the plunder of a season's traffic. Upon the banks of the stream were many tokens of the inconstancy of purpose of the border life,--abandoned sites of Indian villages and deserted fortifications that had been erected by traders to serve for temporary convenience and protection. Nowhere was there a sign of the American interpretation of the word "enterprise." On June 26th they reached the mouth of the Kansas River, now marked by Kansas City. There they camped for two days; there they fell in with the Kansas Indians, with whom they held a pacific conference; and there the hunters met for the first time with buffalo. Forty-three days had been consumed in crossing what is now the State of Missouri. July 26th camp was made at the mouth of the Platte River, six hundred miles from St. Louis, where the town of Plattsmouth, Neb., stands; and that date marked a radical change in the duties and conduct of the expedition. The disposition of the Indians of the Lower Missouri was already pretty well known, so that no time had been spent in establishing relations with them. They were still mostly unspoiled savages, to be sure; but they were acquainted with the appearance of the whites, at least, and their bearing toward traders and colonists had been for the most part decent. But the situation upon the Upper Missouri was altogether different. Although the problem might not be definitely stated, because many of its factors were unknown, it could be foreseen that a solution would tax the genius of civilization. The dominant nations of the plains Indians--those whose numerical strength and war-like character made them feared by their neighbors--had their domain above the Platte. The Sioux in particular had a mighty reputation, established by treachery and ferocity in war. Their history recorded a constant succession of cruel wars, most of which had had no justification save in arrogance and bloody-mindedness. They did not want to live at peace; for peace signified to them a state of craven inanition. The mission of Lewis and Clark was directed pointedly against that manner of behavior; they were not only to secure themselves against hostility, but were also to endeavor to reconcile the warring tribes and nations to one another. That was an undertaking calling for a high degree of tact and courage.