Statistics for occurrence #1 of “Harper's Ferry” in chapter 47 of Admiral David D. Porter, The Naval History of the Civil War.:

...nt Davis reached the city, a few days afterwards, offered his services to the Confederate Government. They were at once accepted, and Semmes proceeded to Washington. after a visit to Richmond and Harper's Ferry , to ascertain the character of certain machinery at the latter place, in anticipation of the enlargement of the Tredagar Works at Richmond, for the South meant war from the beginning, in case of any ...
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Entity Corpus Doc Corpus Doc  
Harper's Ferry (West Virginia, United States) 10,974 4 304 0 0 user votes

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