The Keepers of the Trail by Joseph Altsheler

Historical novel, part of the Young Trailers series. According to the original publisher Two boys, Henry Ware and Paul Cotter, and three scouts are the chief characters in these books dealing with frontier life and adventures with the Indians about the time of the Revolutionary War. Each story is complete in itself, full of excitement, and historically accurate. In the Keepers of the Trail, In this book the boys and their comrades defeat a great Indian army and save Kentucky from invasion. According to Wikpedia, Joseph Alexander Altsheler (April 29, 1862 - June 5, 1919), was an American author of popular juvenile historical fiction.