Flapping Eagle lives on an Indian reservation in the southwestern United States. He drinks too much, one of many sources of disagreement between Flap and his sweetheart, Dorothy Bluebell. He also has trouble with his arch-rival, Sgt. Rafferty, a brutal, bigoted police officer in town.

Flap launches protests, first disrupting a construction crew’s bulldozer impeding on Indian land, then stealing a train after a lawyer, Wounded Bear, leads him to believe the train would become legal Indian property once it’s in their territory.

Rafferty is violently beaten by Flap after a series of insults and abuses and the last straw, the shooting of a dog. Flap, now an Indian activist whose protests have gained him publicity and popularity, leads a protest march through the town. From a hospital window, Rafferty aims a rifle and assassinates him.