As General Sims' Army Scout, Bronco was sent to scout the area in the Oklahoma territory as a possible home for the defeated Osage tribe which are being held as prisoners by Col. Arthur's troops. Bronco reports that the area in Oklahoma is unfit for human habitation but Col. Arthur will only allow the tribe to move to Oklahoma or Kansas neither of which is acceptable to Chief Crippled Bear. The Osage wish to move to Wyoming which both Bronco and Capt. Williams support. Arthur's aide, Sgt. Hughes, tries to help a sick Osage baby. When Bronco discovers the issue, he immediately recognizes it as cholera. When Col. Arthur drinks from Hughes water bucket, he and Hughes must be quarantined. Both become sick with the disease. Arthur relents and creates a treaty giving the Osage the right to move to Wyoming but he dies before he can sign it. This leaves the decision to Maj. Trask who was sent to relieve Arthur but Trask has his own reasons for his plans.