Although he covers the battle in detail, he never loses sight of the big picture. Brawner's Farm, Pope's disjointed attacks, and Longstreet's attack all make sense now. McDowell's part in the Union fiasco is also detailed. This book covers Lee's most brilliant and daring campaigns. Vincent Esposito makes masterly use of maps to explain the strategy behind the Civil War and other conflicts of the era.
Strategy leading up to battle and the battles themselves are well covered.
In addition to the Civil War, the sections on the Mexican War and Spanish-American War are excellent. These are better maps than those on the West Point website which were simplified to fit a shorter curriculum.