I picked this book up a number of years ago at the Whitman Mission Massacre Site, Oregon. I just re-found it on my shelves and realized I'd never read it.
It is written by Bonnie Jo Hunt, a Lakota Sioux. To record and preserve her native heritage, in 1997 she launched the Mad Bear Press which publishes American history dealing with life on the western frontier. This is the 7th book in the Lone Wolf Clan series.
It is a story developed around the journal of Major Osborne Cross in 1849, while leading the newly formed Mounted Riflemen to Oregon Territory. Fear was high in Oregon during this time because of the recent Whitman Mission massacre and the killers still at large. The Regiment was the first large U.S. military force to make the 2000 mile trek westward. They crossed the plains and the Rockies with 600 enlisted men - 160 wagons. Desertion was running high in the ranks because of the concurrent California Gold Rush. This is their story of the journey from St. Louis to Oregon City. Perhaps a story that many have not heard of along the Oregon Trail. An interesting read told well from both the Indian perspective as well as the soldiers.