Most people still view the final, bloody confrontation between Ulysses S. Grant and Robert E. Lee as a relentless grinding away of the Army of Northern Virginia in a continuous battle of attrition, attributing Grant's victory not to his generalship but to his overwhelming superiority in numbers. General Andrew A. Humphreys (1810-1883), chief of staff of the Army of the Potomac and later the fiery commander of the Second Corps, provides readers with a far more enlightened understanding in The Virginia Campaign, 1864 and 1865. Humphreys was known for his high military scholarship,...