On July 21, 1861, two armies clashed for the first time on the fields overlooking Bull Run. Heavy fighting swept away any notion of a quick war. In August 1862, Union and Confederate armies converged for a second time on the plains of Manassas. The Confederates won a solid victory bringing them to the height of their power.  The Manassas Battlefield is a National Park. There is a visitor center and several sites around the battlefield such as the Stone House, and the bridge at Bull Run. You can do walking tours from the visitor center, but the entire Battlefield is bi-sected into 4 parts by two fairly major roads.