Statistics for occurrence #1 of “Yorktown” in chapter 8 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 5: Forts and Artillery.:

...ations, where it was expected to operate against the decks of vessels, the great weight of the projectiles being exceedingly destructive. These mortars were sometimes used for siege purposes, as at Yorktown , but their great weight made them difficult to move and emplace in temporary works. the breech-loading rifle, and the repeaters of the day were considered especially undesirable for military purpose...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Yorktown (Virginia, United States) 5,134 72 356 0 0 user votes
Yorktown (Arkansas, United States) 16 0 0 0 0 user votes
Yorktown (Pennsylvania, United States) 5 0 1 0 0 user votes
Yorktown (Illinois, United States) 0 0 0 0 0 user votes
Yorktown (Indiana, United States) 0 0 0 0 0 user votes
Yorktown (Iowa, United States) 0 0 0 0 0 user votes
Yorktown (Kentucky, United States) 0 0 0 0 0 user votes
Yorktown (Maryland, United States) 0 0 0 0 0 user votes
Yorktown (Missouri, United States) 0 0 0 0 0 user votes
Yorktown (New Jersey, United States) 0 0 0 0 0 user votes
Yorktown (New Mexico, United States) 0 0 0 0 0 user votes
Yorktown (New York, United States) 0 0 0 0 0 user votes
Yorktown (North Carolina, United States) 0 0 0 0 0 user votes
Yorktown (Ohio, United States) 0 0 0 0 0 user votes
Yorktown (South Dakota, United States) 0 0 0 0 0 user votes
Yorktown (Tennessee, United States) 0 0 0 0 0 user votes
Yorktown (Texas, 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.