Prior to the battle of Gettysburg on July 1-3, 1863, the costliest battle of the Civil War had been Antietam, in September 1862, in which more than 23,000 were killed or wounded in eleven hours. At Gettysburg, approximately 33,000 were killed or wounded and another 10,000 missing in action. The History Buff's Guide(TM) to Gettysburg covers the action of those days and the surrounding area by means of detailed...