With a chemistry that is rare in military history, generals Robert E. Lee and Thomas "Stonewall" Jackson led the Confederate army to a string of victories in the first three years of the Civil War. What was it about their styles, backgrounds, even their faith, that cemented them together into a fighting machine that consistently won despite often overwhelming odds against them? Making a fresh evaluation, Christian Keller probes how this friendship galvanized their troops, and how the 1863 death of Jackson set the South on course for defeat.