- Battle of the Little Bighorn: US 7th Cavalry under Brevet Major General George Armstrong Custer wiped out by Sioux and Cheyenne warriors led by Chiefs Crazy Horse and Sitting Bull in what has become famously known as "Custer's Last Stand"
- Boston Custer, brother of George Armstrong Custer, dies at 27
George Armstrong Custer, United States Army officer and cavalry commander in the American Civil War and the American Indian Wars, dies at the Battle of Little Bighorn aged 36
- Lame White Man, Cheyenne, dies at Little Bighorn
- Myles Keogh, US officer, dies at Little Bighorn
- Thomas W Custer, brother of George Custer, dies at Little Bighorn