Vengeance Valley (Rocky Mountain Saint #8)
B.N. Rundell

But when he is confronted with the massacre of a wagon train of settlers on the Oregon trail, and is asked by the mountain man scout for General Harney at Fort Laramie, Jim Baker, to scout out the marauding Indians responsible, he accepts the charge, but mainly out of concern for his own family. And that scout brings him up against a blood-thirsty self-appointed war chief of the Crow who is bent on vengeance against any and all whites for what he believes is the attempt to destroy his own people with disease, murder, and by stealing their homelands.
The truth becomes known about this man who has taken the name of a figure from the history of the Crow people and turned it into one of shame, vengeance and blood-letting. It will take an alliance of a group of freighters, a wagon train of settlers, and a party of the traditional enemy of the crow from the Arapaho band of Tate's first wife to bring an end to this vengeance quest by none other than Bad Heart Bear.