Statistics for occurrence #1 of “Maryland” in chapter 3 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 10: The Armies and the Leaders.:

...cond Manassas on August 30, 1862. Despite his inferior numbers, his aggressiveness and his ability to gage his opponents had enabled him to rid Virginia of Federal forces, and he resolved to invade Maryland . Davis acquiesced in his farsighted plan, and the march began on September 5th. The detaching of Jackson to take Harper's Ferry and the loss of one of Lee's orders, which fell into McClellan's ha...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Maryland (Maryland, United States) 18,573 20 3 0 0 user votes
Maryland (Illinois, United States) 0 0 0 0 0 user votes
Maryland (Liberia) 0 0 0 0 0 user votes
Maryland (Louisiana, United States) 0 0 0 0 0 user votes
Maryland (Louisiana, United States) 0 0 0 0 0 user votes
Maryland (Louisiana, United States) 0 0 0 0 0 user votes
Maryland (New Jersey, United States) 0 0 0 0 0 user votes
Maryland (New York, 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.