Sacajawea, a Shoshone woman, became an invaluable guide, interpreter, and translator to the Lewis and Clark Expedition. At fifteen years old, she accompanied her husband, fur trader Charbonneau, when he joined the Corps of Discovery in 1805. Throughout the 6,000-mile journey, her presence with their infant son Jean Baptiste signaled to other Indians that the expedition was not a war party, and Captain Clark wrote that a woman traveling with a party of men was a token of peace. At Fort Mandan on March 17, 1803, French fur trader and interpreter Toussaint Charbonneau, his wife Sacajawea, and their infant son joined the Corps of Discovery, which departed on April 7, 1905. At Camp Fortunate on August 15, 1805, Sacajawea recognized the Shoshone Chief Cameahwait as her brother, whom she had not seen since childhood, and their reunion became a pivotal moment because the Shoshones then trusted the explorers and traded the horses they desperately needed. At Fort Clatsop, now Astoria, Oregon, she helped defuse tensions with local tribes by trading her beaded belt to a Chinook chief, and she later insisted on traveling with the men to see a beached whale. From July 3 to August 12, 1806, when Lewis and Clark split up on the return trip, Sacajawea and her family stayed with Captain Clark’s group, guided them over Bozeman Pass to the Yellowstone River, and then rejoined Captain Lewis as he recovered from an accidental gunshot wound. The Eastern Shoshone believe Sacajawea is buried in the Wind River Mountains west of here, while Charbonneau’s second wife, Sacajawea’s sister, is buried in North Dakota.