On a September day in 1877, hundreds of Sioux and soldiers at Camp Robinson crowded around a fatally injured Lakota leader. A young doctor forced his way through the crowd, only to see the victim fading before him. It was the famed Crazy Horse. From intense moments like this to encounters with such legendary western figures as Calamity Jane and Red Cloud, Valentine Trant O'Connell McGillycuddy's life (1849 1939) encapsulated key events in American history that changed the lives of Native people forever. In "Valentine T. McGillycuddy: Army Surgeon," "Agent to the Sioux, " the first biography...