On August 27, 1804, the Lewis and Clark Expedition camped for four days downstream from Calumet Bluff after encountering three American Indian boys who told them of a large Yankton Sioux camp nearby. With President Jefferson wanting good relations established with Indians, Meriwether Lewis and William Clark held a grand meeting and feast with the Yanktons upstream at Calumet Bluff on August 30-31, where they explained the expedition's exploratory purposes and Jefferson's desire for peace. Chiefs Shake Hand and Half Man spoke of the tribe's need for reliable trade, and after making contact with the Siouan people at Calumet Bluff, the Corps of Discovery resumed its trek west.