Led american soldiers into the little bighorn valley to protect miners from native american attacks

George A. Custer.

Explanation:

George Armstrong Custer was an officer of the American army. He is recognized for his great contribution during the American Civil War, where he fought for unity, and during the Indian Wars, where he was credited with leading US soldiers to the Little Bighorn Valley to protect miners from Native American attacks.

While alive his reputation was unbeatable and was considered a great winner on the battlefield. His reputation grew even more during the civil war, especially after the union's victory.