Statistics for occurrence #1 of “Portsmouth” in chapter 2 of Admiral David D. Porter, The Naval History of the Civil War.:

... guns on a side on board the Pennsylvania, which sturdy old castle commanded the whole yard; and fifty good seamen on board could have bid defiance to 5,000 Confederates in arms, and held Norfolk and Portsmouth under her guns until every ship was hauled out of harm's way. After the arrival of the Pawnee had made the yard doubly secure, the shells were drawn from the Pennsylvania's guns and the guns spik...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Portsmouth (New Hampshire, United States) 470 0 134 0 0 user votes
Portsmouth (United Kingdom) 107 0 13 0 0 user votes
Portsmouth (Dominica) 0 0 0 0 0 user votes
Portsmouth (Iowa, United States) 0 0 0 0 0 user votes
Portsmouth (Kentucky, United States) 0 0 0 0 0 user votes
Portsmouth (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.