We were also fortunate enough to engage in our service a Canadian Frenchmen, who had been with the Chayenne Indians on the Black mountains, and last summer descended thence by the Little Missouri.
Meriwether Lewis, William Clark (1842). “History of the Expedition Under the Command of Captains Lewis and Clarke, to the Sources of the Missouri: Thence Across the Rockey Mountains, and Down the River Columbia to the Pacific Ocean ; Performed During the Years 1804, 1805, 1806, by Order of the Government of the United States”, p.126
