Statistics for occurrence #1 of “Potomac” in part 1.2, chapter 1.5 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 2: Two Years of Grim War.:

...www.w3.org/TR/xhtml1/strict"> This splendid landscape photograph of the pontoon bridge at Berlin, Maryland, was taken in October, 1862. On the 26th McClellan crossed the Potomac here for the last time in command of an army. Around this quiet and picturesque country the Army of the Potomac bivouacked during October, 1862, leaving two corps posted at Harper's Ferry to hold t...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Potomac (Illinois, United States) 2 0 0 0 0 user votes
Potomac (Maryland, United States) 1 0 1 0 0 user votes
Potomac (Montana, United States) 0 0 0 0 0 user votes
Potomac (United States) 0 0 0 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.