Statistics for occurrence #1 of “Portsmouth” in chapter 62 of Admiral David D. Porter, The Naval History of the Civil War.:

... Princeton 3,870 28 916 96 2,953 32 do Oct. 16, 1862 Susquehanna. Schooner Prize 837 84 237 54 600 30 do Oct. 24, 1863 Octorara. Sloop Pioneer 2,366 92 1,058 18 1,308 74 New York April 27, 1863 Portsmouth . Steamer Patras, cargo of 58,787 64 6,336 82 52,450 82 do Dec. 9, 1863 Bienville. Steamer Planter 198,690 58 16,872 00 181,818 58 Key West Feb. 29, 1864 Lackawanna. Steamer Patras 34,000 00 ...
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.