The following photos courtesy of George Petropol, Manassas, Virginia
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On 16 July, 1861, the untried Union army under Brig. Gen. Irvin McDowell, 35,000 strong, marched out of the Washington defenses to give battle to the Confederate army, which was concentrated around the vital railroad junction at Manassas. The Confederate army, about 22,000 men, under the command of Brig. Gen. P.G.T. Beauregard, guarded the fords of Bull Run. On July 18, McDowell reached Centreville and pushed southwest, attempting to cross at Blackburn’s Ford. He was repulsed. This action was a reconnaissance-in-force prior to the main event at Manassas/Bull Run. Because of this action, Union commander McDowell decided on the flanking maneuver he employed at First Manassas
 
Courtesy of CWSAC Battle Summaries

Blackburn's Ford

Enlarge "Guarding the Fords"