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1-712: Mitutanka (Matootonah) was the lower Mandan village at the time of the Lewis and Clark Expedition . At the time that Lewis and Clark visited the main chief was Sheheke . After a catastrophic smallpox epidemic , the Nuitadi Mandans of Good Boy moved north and later built Mitutanka at the confluence of the Knife River with the Missouri River . Mitutanka was on the west Bank while the Ruptare town of Ruptare