 This is CBS Eye on the World. I'm John Batchelor. I'm talking to Patrick K. O'Donnell, the author of a new book, highly recommended, especially for those who know the Civil War. But if you don't, you will learn it from the saddle level. The Unvanquished, the untold story of Lincoln's special forces, the manhunt for Mosby's Rangers, and the shadow war that forged America's special operations.