Statistics for occurrence #1 of “Madrid” in chapter 1 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 9: Poetry and Eloquence.:

... Madrid
What the war brought to the South--ruins of a mill in Petersburg just after the capture of the town by Grant. ...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Madrid (Spain) 778 2 2 0 0 user votes
Madrid (Alabama, United States) 0 0 0 0 0 user votes
Madrid (Colombia) 0 0 0 0 0 user votes
Madrid (Colorado, United States) 0 0 0 0 0 user votes
Madrid (Iowa, United States) 0 0 0 0 0 user votes
Madrid (Kentucky, United States) 0 0 0 0 0 user votes
Madrid (Maine, United States) 0 0 0 0 0 user votes
Madrid (Nebraska, United States) 0 0 0 0 0 user votes
Madrid (New Mexico, United States) 0 0 0 0 0 user votes
Madrid (New York, United States) 0 0 0 0 0 user votes
Madrid (Philippines) 0 0 0 0 0 user votes
Madrid (Spain) 0 0 0 0 0 user votes
Madrid (Spain) 0 0 0 0 0 user votes
Madrid (Virginia, 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.