[The expedition] had now arrived at the head waters of the Columbia, which were among the main points embraced by the enterprise of Mr. Astor. These upper streams were reputed to abound in beaver, and had as yet been unmolested by the white trapper. The numerous signs of beaver met with during the recent search for timber gave evidence that the neighborhood was a good ‘trapping ground.’ Here then it was proper to begin to cast loose those leashes of hardy trappers, that are detached from trading parties, in the very heart of the wilderness. The men detached in the present instance were Alexander Carson, Louis St. Michel, Pierre Detaye, and Pierre Delaunay. [Illustration: Snake River crossing. Photo by Author] These men were instructed to “trap upon the upper part of Mad (Snake) River, and upon the neighboring streams.” Whether they entered Yellowstone Park at this time is entirely conjectural. In the spring of 1812 they were attacked by Crow Indians near the Three Forks, and Detaye was killed. On June 29, 1812, seven men led by Robert Stuart left Astoria carrying dispatches overland to Astor. The party arrived at St. Louis on April 30, 1813. They were the first organized transcontinental expedition eastbound after the return of Lewis and Clark, and the first to discover South Pass and the great Platte or Central route which was destined to become the main highway of the covered-wagon migrations. This journey again took them through Jackson’s Hole. Stuart had gone out to Astoria by sea, but his fellow travelers had all been members of the Hunt expedition. These were John Day, Benjamin Jones, Francois Leclerc, Andre Valle, Ramsay Crooks, and Robert McClellan. Soon after setting out up the Columbia River John Day became violently deranged because of his sufferings from the previous winter and had to be sent back to Astoria. To the six remaining travelers, however, was eventually added Joseph Miller, who had been with Hoback, Robinson, and Reznor after they left Hunt in October 1811. The Stuart party reached Bear River intending to go due east; but there Crow Indians got on their trail. To elude them Stuart went north to the Snake and thus struck Hunt’s route of the preceding year. At Snake or “Mad River” near the present Idaho-Wyoming boundary, Crows stampeded their horses. They built a raft and descended the Snake for over a hundred miles, then crossed over the Snake River Range to Pierre’s Hole at the foot of the “Pilot Knobs,” where they reached familiar territory.