The Last Rebel - Joseph A. Altsheler

Arthur West has been taken as a prisoner of war by Colonel Hetherhill of the Confederate States of America, and imprisoned at Fort Defiance, where an oddly small number of soldiers are stationed. More odd than the size of the fort's company, however, is the fact that the Civil War ended thirty years prior to West's capture. This is the story of West's attempts to regain his freedom. - Summary by David Gore