In September 1809, John Colter and John Potts, former members of the Lewis and Clark Expedition, were trapping beaver on the Jefferson River near the headwaters when a band of Blackfeet Indians captured Colter and killed Potts. The Blackfeet stripped Colter, gave him a head start, and ordered him to run across the prickly pear cactus-covered flat east of the river, pursuing him as he fled. He outran them over a six mile course and reached timber along the Madison River, where he may have hidden under a driftwood jam or in a beaver lodge. After nightfall, naked and weaponless, he headed east and more than a week later reappeared sunburned, emaciated, and with swollen feet at the Missouri Fur Company trading post, Fort Raymond, at the confluence of the Yellowstone and Big Horn Rivers, more than 200 miles away. Colter’s Run later inspired novels and motion pictures, and local businesses sponsor an annual Colter-inspired marathon run without nudity and without the danger of being killed by the Blackfeet.