Statistics for occurrence #1 of “Harper's Ferry” in chapter 4 of An English Combatant, Lieutenant of Artillery of the Field Staff., Battlefields of the South from Bull Run to Fredericksburgh; with sketches of Confederate commanders, and gossip of the camps.:

...strength, that it was impossible to inflict any decided punishment with the few troops under his command; Colonel Jackson, therefore, retreated slowly and orderly towards Charlestown, (midway between Harper's Ferry and Winchester,) whither Johnston's main force had retired. While Johnston's and Patterson's forces were thus facing each other near Charlestown things were unchanged at Manassas. Reports, indeed...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Harper's Ferry (West Virginia, United States) 10,974 96 304 0 0 user votes

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