Durante a Convenção de 1888, que determina os limites e divisões do território americano, uma família de músicos enfrenta problemas quando seus membros divergem quanto à inclinação política. Ao se mudar para Dakota, um território pró-republicano, a orientação democrata do avô acaba trazendo dificuldades para a família.

In the latter half of the 19th century, gold is discovered in the Black Hills, sacred land of the Lakota people. Gold diggers, profiteers and adventurers flock to the region. Among them is the hard-hearted land speculator Bludgeon, who tries to expel the Lakota using brutal methods. Lakota warriors retaliate, and soon the gold diggers' town becomes a battlefield.

U.S. Marshal Rocky Lane arrives to help his friend Nugget whose shipments are being robbed. Learning the gang only goes for incoming shipments, he figures they are repacking the loot and having Nugget ship it out. So he hijacks the next outgoing shipment finding a box labeled tools contains gold bars. Then posing as an outlaw he makes a deal with the gang hoping to round them up. But the boss learns he is a Marshal and he is made a prisoner.