George Armstrong Custer

George Armstrong Custer (December 5, 1839 – June 25, 1876) was a United States Army officer and cavalry commander in the American Civil War[1] and the American Indian Wars.[2]
Custer graduated from West Point in 1861 at the bottom of his class,[3] but as the Civil War was just starting, trained officers were in immediate demand. He worked closely with General George B. McClellan and the future General Alfred Pleasonton, both of whom recognized his qualities as a cavalry leader, and he was brevetted brigadier general of volunteers at age 23. Only a few days after his promotion, he fought at the Battle of Gettysburg, where he commanded the Michigan Cavalry Brigade and despite being outnumbered, defeated J. E. B. Stuart's attack at what is now known as the East Cavalry Field.
After the war, Custer was appointed a lieutenant colonel in the Regular Army and was sent west to fight in the Indian Wars. On June 25, 1876, while leading the 7th Cavalry Regiment at the Battle of the Little Bighorn in Montana Territory against a coalition of Native American tribes, he was killed along with all of the five companies he led.
https://en.wikipedia.org/wiki/George_Armstrong_Custer