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The Corps of Discovery are sent off from St. Louis, Missouri.
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The Corps of Discovery see and meet friendly Yankton Sioux.
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The expedition's captains of the keel boats they used to travel upriver now build a fort, called Fort Mandan.
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Lewis tries to negotiate for horses from the Shoshones. turns out, the Cheif is Sacagawea's brother, which he lends them to the Corps of Discovery.
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The Corps of Discovery celebrate Christmas at the fort, named Fort Clatsop for the neighboring Indian tribe.
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Two Blackfeet are killed when the Corps of Discovery fight them when the Indians tried to take away their horses and guns.
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The Corps of Discovery pay their respects to the grave of Charles Floyd, the only member that died.
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The Corps of Discovery had been given up for dead by citizens of St. Louis, but they arrive home.
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The group had encountered some Nez Perce Indians and now have five new canoes, which they launched into the Clearwater River, Orofino, Idaho, with the river at their backs for the first time since leaving St. Louis.