The generalship of Robert E. Lee, the Confederacy's greatest commander, has long fascinated students of the American Civil War. In assessing Lee and his military career, historians have faced the great challenge of explaining how a man who achieved extraordinary battlefield success in 1862-1863 ended up surrendering his army and accepting the defeat of his cause in 1865. How, in just under two years, could Lee, the Army of Northern Virginia, and the...