Lewis and Clark timeline 5 By facebooker_100000178898864 Jul 3, 1806 Met some Blackfeet men from the Blackfeet nation The Blackfeet men tried to steal their weapons in the middle of the night. Period: Jul 3, 1806 to Aug 11, 1806 Lewis and Clack timespan 5 Aug 11, 1806 Reached Yellowstone and Missouri rivers