There were two battles fought in different years which covered much of the same ground. The first was the opening battle of the Civil War in Virginia, a cake walk the Union thought and where Stonewall earned his nickname. This is a relatively compact site which is contained around the park headquarters and the hills around it. The second battle began a few miles away when Stonewall found a passing Union army on the road below the high ground he occupied and he ordered an attack. This battle is spread out so you must drive to key sites and this is a bit dangerous. Signage is poor, you get about 50 feet of notice of the place you turn in and locals tend to tailgate you when you don't drive in excess of the speed limit. I was almost several times at Manassas, Wilderness and Chancellorsville. Second Manassas was much more fiercely fought and if you walk Jackson's positions on each day of battle, you'll understand the high casualty rate for the second battle. Good interpretation in the Visitors' Center and a very photogenic site, lots of cannons and the statue of Stonewall towering over the battlefield.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.