Initial United States contact with the Lakota during the Lewis and Clark Expedition of 1804–1806 was marked by a standoff. Lakota bands refused to allow the explorers to continue upstream, and the expedition prepared for battle, which never came. Some bands of Lakota became the first indigenous people to help the United States Army in an inter-tribal war west of the Missouri, during the Arikara War in 1823. In 1843, the southern Lakota attacked the village of Pawnee Chief Blue Coat near the Loup in Nebraska, killing many and burning half of the earth lodges.
The next time the Lakota inflicted a blow so severe to the Pawnee would be in 1873, during the Massacre Canyon battle near Republican River. Nearly half a century later, after the United States had built Fort Laramie without permission on Lakota land, it negotiated the Fort Laramie Treaty of 1851 to protect European-American travelers on the Oregon Trail. The Cheyenne and Lakota had previously attacked emigrant parties in a competition for resources, and also because some settlers had encroached on their lands. The Fort Laramie Treaty acknowledged Lakota sovereignty over the Great Plains in exchange for free passage for European Americans on the Oregon Trail for “as long as the river flows and the eagle flies”.
The U.S. government did not enforce the treaty restriction against unauthorized settlement, and Lakota and other bands attacked settlers and even emigrant trains as part of their resistance to this encroachment. Public pressure increased for the U.S. Army to punish them. On September 3, 1855, 700 soldiers under U.S. Brevet Major General William S. Harney avenged the Grattan massacre by attacking a Lakota village in Nebraska, killing about 100 men, women, and children. A series of short “wars” followed, and in 1862–1864, as Native American refugees from the “Dakota War of 1862” in Minnesota fled west to their allies in Montana and Dakota Territory. After the American Civil War increasing illegal settlement by whites on the Plains resulted in war again with the Lakota.
The Black Hills were considered sacred by the Lakota, and they objected to mining. Between 1866 and 1868 the U.S. Army fought the Lakota and their allies along the Bozeman Trail over U.S. forts built to protect miners traveling along the trail. Oglala Chief Red Cloud led his people to victory in Red Cloud’s War. In 1868, the United States signed the Fort Laramie Treaty of 1868, exempting the Black Hills from all white settlement forever. But four years later gold was discovered there, and prospectors descended on the area. The Lakota attacks on settlers and miners were met by military force conducted by such army commanders as Lieutenant Colonel George Armstrong Custer. General Philip Sheridan encouraged his troops to hunt and kill the buffalo as a means of “destroying the Indians’ commissary.”
The allied Lakota and Arapaho bands and the unified Northern Cheyenne were involved in much of the warfare after 1860. They fought a successful delaying action against General George Crook’s army at the Battle of the Rosebud, preventing Crook from locating and attacking their camp. A week later they defeated the U.S. 7th Cavalry in 1876 at the Battle of the Little Bighorn at the Crow Indian Reservation (1868 boundaries). Custer attacked an encampment of several tribes, which was much larger than he realized. Their combined forces, led by Chief Crazy Horse, killed 258 soldiers, wiping out the entire Custer battalion and inflicting more than 50% casualties on the regiment.
