On June 25, 1876, in the plains of southern Montana, Lieutenant Colonel George Armstrong Custer led the Seventh Cavalry into battle with a powerful force of Sioux and Cheyenne warriors. Not one member of Custer's battalion survived the battle, the greatest single victory of the Plains Indians in their war with the United States. Since that fateful day, historians have debated the tactics and strategy of both sides, exactly how the battle proceeded, and what Custer should have done differently.