Lewis and Clark were reunited at this site after parting company near the Big Hole and Jefferson Rivers. Lewis arrived first and lodged with a band of Shoshone. When the Indians began preparing to head east to their buffalo hunting grounds, Lewis persuaded them to wait for Clark's return. When at last Clark arrived with Sacagawea, she recognized the leader of the Shoshone as her brother. It was in part this fortunate twist of fate that led to the Shoshone agreeing to help the expedition cross the Continental Divide-and gave the camp its name.