Amidst the vast literature of the Civil War, one of the most significant and enlightening documents remains largely unknown. A day-by-day, uninterrupted, four-year chronicle by a mature, keenly observant clerk in the War Department of the Confederacy, the wartime diary of John Beauchamp Jones was first published in two volumes of small type in 1866. Over the years, the diary was republished three more times--but never with an index or an editorial apparatus to guide a reader through the extraordinary mass of information it contained. Published here with an authoritative editorial framework,...