Harry Castlemon 
Frank on a Gun-Boat [PDF ebook] 

During the American Civil War, many teenage boys braved the battlefield in service to their country. That’s exactly what the spirited young protagonist at the center of Frank on a Gun-Boat decides to do when his cousin Archie asks him to join up. Though barely old enough to fend for themselves, the duo sets off to join the naval forces that have gathered to fend off the rebels. Will they survive the conflict and make it to manhood? Read Frank on a Gun-Boat to find out.