"[...] The tenth of April, 1833, the travellers boarded the "Yellowstone," on its third trip to the posts of the upper Missouri. Before parting with Major O'Fallon, the latter gave them a manuscript map copied from one prepared during the Lewis and Clark expedition by Clark himself, the topographer of that famous exploring party. This chart was constantly used by the prince. His narrative recites the daily routine and incidents of the river voyage on the outward route. By April 22 the steamer had reached Fort (then Cantonment) Leavenworth, and ten days later they were at Bellevue, just below the present Omaha. It was not until the eighteenth of May that the prince's party were greeted by their first sight of buffalo, and by the last of that month they had arrived at Fort Pierre, the company's main post among the Sioux. Here our travellers were transferred from the "Yellowstone" to her sister steamer, the "Assiniboine," a newer, larger boat[...]".
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