The expedition to explore the West included the help of a French trapper and his Shoshone wife. Who served as a guide and interpreter for the expedition?

Both Toussaint Charbonneau and Sacajawea served as interpreters. Toussaint was useful in bargaining with other trappers because he spoke French and Sacajawea could speak Shoshone and Hidatsa. Toussaint also served as the camp cook while Sacajawea became invaluable as a guide in the region of her birth, near the Three Forks of the Missouri.