Confederate E. Porter Alexander’s Map of the Action at Blackford’s Ford, 7/18/1861 (Courtesy of Manassas National Battlefield Park)
Harper’s Weekly Map of the Battlefield 8/3/1861 (see here)
D. B. Harris Sketch Map (Courtesy USNPS, MNBP)
NPS Map of the Battlefield 1861-1862
West Point Atlas of the Civil War: Situation July 18, 1861
West Point Atlas of the Civil War: Situation 1400 Hours July 21, 1861
Harry Smeltzer
[...] on July 18, 1861. I’ll get to that eventually, I promise. But for now, I have updated the Maps page with the below image of a map of that action drawn by E. Porter Alexander. Check it out. [...]