Statistics for occurrence #1 of “Boston Harbor” in chapter 1.7 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 7: Prisons and Hospitals.:

... else was prepared by the prisoners themselves, or by some old negro paid by the mess. In 1862, some of the Confederate privates taken at Glendale, or Frayser's Farm, were sent to Fort Warren, in Boston Harbor , then under the command of Colonel Dimick, where they remained until after the cartel had been signed. Alexander Hunter, a private in a Virginia regiment, thus speaks of the life in Fort Warren, in...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Boston Harbor (Massachusetts, United States) 627 8 1 0 0 user votes
Boston Harbor (New Hampshire, United States) 0 0 0 0 0 user votes
Boston Harbor (Washington, United States) 0 0 0 0 0 user votes
Boston Harbor (Washington, 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.