The use of an artificial intelligence-based computerized color identifier to determine the precise color of all that Civil War photographs entail brings the men, the landscape, and the action of the Battle of Gettysburg into the 21st Century. Discover a plethora of details that have passed generations of eyes unseen and learn about a Gettysburg photographic mystery brought to light.

Pat Brennan is the author of Secessionville: Assault on Charleston (1996), To Die Game: General J. E. B. Stuart, CSA (1998), and more than twenty articles for a variety of Civil War magazines and journals. Pat is on the Editorial Advisory Board for The Civil War Monitor and his work has appeared in the Chicago Tribune and The Reader. He has lectured around the country on the Civil War and Bob Dylan.