expedition survive the severe winter of 1804–05. Drouillard established good relations with the Mandan people, who aided the members of the expedition. The Corps built Fort Mandan as their winter quarters. Lewis recognized that Drouillard's language skills were critical to the expedition, as when they were scouting for Shoshone in present-day Montana. He wrote on August 14, 1805:"The means I had of communicating with these people was by way of Drewyer [Drouillard] who understood perfectly the common language of jesticulation [sic] or signs which seems to be universally understood by all the Nations we have yet seen. It is true that this language is imperfect and liable to error but is much less so than would be expected. The strong parts of the ideas are seldom mistaken." Missouri Fur Company In 1807, Drouillard traveled again up the Missouri River as part of an expedition led by the Spanish fur trader Manuel Lisa; others in the party included John Potts, Peter Weise and John Colter, all of whom had also been part of the Lewis and Clark Expedition. During the winter of 1807–08, Drouillard traveled the lands of the Crow Indians in the Bighorn Mountains. He gathered information which he gave to William Clark after returning to St. Louis; Clark improved his maps of the area with the additions. In 1809, Drouillard joined Lisa's Missouri Fur Company, based in St. Louis. The city was developing rapidly based on revenues from the western fur trade. Lisa sent his trappers to the upper Missouri River for furs. Death In 1810, Drouillard failed to return from a beaver-trapping trip in the Three Forks region of the upper Missouri River, where the expedition had already encountered hostilities from the Blackfeet and Gros Ventre peoples. A search party found the remains of him and his horse. Drouillard had been beheaded, and his entrails were strewn about in ritual mutilation. From evidence at the site, his comrades said that he must have fought and killed several Indians before his death. The Americans hastily buried him in an unmarked grave. Legacy and honors Mount Drouillard (formerly Mount Drewyer) in Teton County, Montana, is named in his honor. The George Drouillard Museum was established in 1996 near Bellefontaine, Ohio by the Shawnee Nation, URB, a state-recognized tribe, as part of their complex including the Zane Shawnee Caverns. March 2013, the Grundy County Heritage Museum in Morrison, Iowa, had an