The Mud Springs Station Archeological District, which includes the Mud Springs Pony Express Station Site, near Dalton, Nebraska, has significance dating to the mid-19th century. The Pony Express station at Mud Springs, staffed by U.S. soldiers, was attacked by Lakota, Cheyenne, and Arapaho tribesmen during February 4–6, 1865, in what became known as the Battle of Mud Springs.