Tödlicher Irrtum (1970)

At the end of the 19th century, the Wyoming Oil Company has established itself in the vicinity of Wind River City at the foot of the Rocky Mountains, where they have been illegally pumping oil from Native American territory. One of the company's greedy agents, Mike Allison, kicks out both his white partners and the Native Americans. He has his some of his associates secretly murdered and blames it on the Native Americans, who are then killed when they get in the way of his plans. Five chiefs with lifelong shares in the Oil Company die mysteriously as a result. The young chief Shave Head asks his a half-blooded brother Chris Howard for help. Chris assumes the post of deputy sheriff and tries to expose Allison and the murderers. When a representative of the Oil Company turns up in Wind River City and exposes Allison's plot, the white inhabitants begin to take sides. Allison does his utmost to defend himself and finally has the oil camp set on fire, passing it off as an act of revenge perpetrated by the Native Americans. The Native Americans are helpless against this accusation and Howard must pay for it with his life.