Lewis recognized that Drouillard's language skills were critical to the expedition, as when they were scouting for Shoshone in present-day Manuel Lisa; others in the party included John Potts and Peter Weise, who had also been part of the Lewis and Clark expedition.
Lewis recognized that Drouillard's language skills were critical to the expedition, as when they were scouting for Shoshone in present-day Montana. In 1807 Drouillard traveled again up the Missouri River as part of an expedition led by fur trader Manuel Lisa; others in the party included John Potts and Peter Weise, who had also been part of the Lewis and Clark expedition.