Statistics for occurrence #1 of “Martinsburg” in chapter 9 of Brigadier-General Ellison Capers, Confederate Military History, a library of Confederate States Military History: Volume 5, South Carolina:

...South Carolina brigade marched with Jack. son's corps from the vicinity of Boonsboro on the 11th and camped at Williamsport on the Potomac. On the 12th, crossing the Potomac, Jackson marched upon Martinsburg , occupied by a Federal force under Brigadier-General White. Gregg was in front and deployed for battle, but White retired upon Harper's Ferry. Jackson entered the town and the inhabitants rejoici...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Martinsburg (West Virginia, United States) 3,548 12 134 0 0 user votes
Martinsburg (Maryland, United States) 21 0 3 0 0 user votes
Martinsburg (New York, United States) 6 0 2 0 0 user votes
Martinsburg (Illinois, United States) 4 0 0 0 0 user votes
Martinsburg (Missouri, United States) 4 0 0 0 0 user votes
Martinsburg (Missouri, United States) 2 0 2 0 0 user votes
Martinsburg (Pennsylvania, United States) 1 0 1 0 0 user votes
Martinsburg (Indiana, United States) 0 0 0 0 0 user votes
Martinsburg (Iowa, United States) 0 0 0 0 0 user votes
Martinsburg (Kentucky, United States) 0 0 0 0 0 user votes
Martinsburg (Kentucky, United States) 0 0 0 0 0 user votes
Martinsburg (Nebraska, United States) 0 0 0 0 0 user votes
Martinsburg (Ohio, United States) 0 0 0 0 0 user votes
Martinsburg (Ohio, United States) 0 0 0 0 0 user votes
Martinsburg (Ohio, United States) 0 0 0 0 0 user votes
Martinsburg (Pennsylvania, 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.