Statistics for occurrence #1 of “Charleston” in chapter 32 of Admiral David D. Porter, The Naval History of the Civil War.:

...owing iron-clads: New Ironsides, Weehawken, Montauk, Keokuk, Patapsco, Nahant, Nantucket and Catskill. This was a powerful fleet, and the Secretary of the Navy depended upon it to close the port of Charleston so effectively that nothing in the shape of an enemy could get in or out; and finally, if opportunity offered, to make an attack on the batteries, remove the obstructions. and go on up to the city....
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Charleston (South Carolina, United States) 9,029 898 1,545 0 0 user votes
Charleston (California, United States) 22 0 0 0 0 user votes
Charleston (North Carolina, United States) 3 0 1 0 0 user votes
Charleston (Mississippi, United States) 2 0 2 0 0 user votes
Charleston (New York, United States) 2 0 2 0 0 user votes
Charleston (Iowa, United States) 0 0 0 0 0 user votes
Charleston (Kentucky, United States) 0 0 0 0 0 user votes
Charleston (Maine, United States) 0 0 0 0 0 user votes
Charleston (Michigan, United States) 0 0 0 0 0 user votes
Charleston (Nevada, United States) 0 0 0 0 0 user votes
Charleston (New Jersey, United States) 0 0 0 0 0 user votes
Charleston (New Zealand) 0 0 0 0 0 user votes
Charleston (Ohio, United States) 0 0 0 0 0 user votes
Charleston (Ohio, United States) 0 0 0 0 0 user votes
Charleston (Ohio, United States) 0 0 0 0 0 user votes
Charleston (Ohio, United States) 0 0 0 0 0 user votes
Charleston (Oregon, United States) 0 0 0 0 0 user votes
Charleston (Pennsylvania, United States) 0 0 0 0 0 user votes
Charleston (Pennsylvania, United States) 0 0 0 0 0 user votes
Charleston (South Australia, Australia) 0 0 0 0 0 user votes
Charleston (Texas, United States) 0 0 0 0 0 user votes
Charleston (Utah, United States) 0 0 0 0 0 user votes
Charleston (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.