Sacagawea
It was apparently also at Fort Mandan that Lewis and Clark first met Sacagawea. Her husband, Toussaint Charbonneau, served as a Hidatsa interpreter for the expedition, and the journals imply that she lived at the fort with him. Her son Jean Baptiste, whom she carried with her throughout the rest of the expedition, was born on February 11th, also possibly at the fort.
Read more about this topic: Fort Mandan