The area around the mouth of the Bighorn River, where it enters the Yellowstone 13 miles east of here, was one of the most significant places in Montana history. The Indians knew the Yellowstone as the Elk River, French explorers called it the Roche Jaune, and they called the Bighorn La Corner. On his return from the Pacific Ocean, Captain William Clark of the Lewis and Clark Expedition camped on the east bank of the Bighorn River on Saturday, July 26, 1806. The following year, on November 21st, 1807, an expedition led by Manuel Lisa, a St. Louis fur trader, arrived at the mouth of the Bighorn River and built a fur trading post named Fort Remon (Raymond) in honor of his two-year-old son, the first building erected in what is now the State of Montana. From there Lisa sent John Colter to contact Indians in winter camp and induce them to come to the post to trade their furs for goods, and on that journey Colter experienced the wonders of present-day Yellowstone National Park. In 1876, during the Sioux and Cheyenne Indian campaign, General Terry and Colonel Gibbon marched up the Bighorn River to the site of Custer's defeat at the Battle of the Little Bighorn, arriving two days after the battle, while the steamer Far West traveled both rivers and carried the wounded back to Fort Abraham Lincoln in Dakota territory.