From Wikipedia

Custer's Last Stand

The Battle of the Little Bighorn —also known as Custer's Last Stand and, in the parlance of the relevant Native Americans, the Battle of Greasy Grass Creek—was an armed engagement between a Lakota–Northern Cheyenne combined force and the 7th Cavalry Regiment of the United States Army. It occurred on June 25 and June 26, 1876, near the Little Bighorn River in the eastern Montana Territory, near what is now Crow Agency, Montana.

The battle was the most famous action of the Great Sioux War of 1876-77 and was a remarkable victory for the Lakota and Northern Cheyenne, led by Sitting Bull. The U.S. Seventh Cavalry, including a column of 700 men led by George Armstrong Custer, was defeated. Five of the Seventh's companies were annihilated and Custer himself was killed as were two of his brothers, a nephew, and a brother-in-law. This battle did not inflict the highest number of casualties by Native Americans against U.S. forces, however. That happened in 1791 at the Battle of the Wabash when the U.S army command suffered over 600 casualties.

Custer Massacre at Big Horn, Montana —
June 25, 1876, artist unknown