The Return of a Man Called Horse (1976)

Lord John Morgan has returned to civilized life in England, but finds he has nothing but disdain for that life. Yearning to embrace the simplicity of the American West-and the Yellow Hands Sioux tribe he left behind, Morgan returns to the tribe's land only to discover that they've been decimated by ruthless, government-backed fur traders. Led by Horse, they fight to repossess their land.