Statistics for occurrence #1 of “Gettysburg” in entry gettysburg-battle-of of Harper's Encyclopedia of United States History:

...right centre; and, after a severe battle on the extreme right of the Nationals, the Confederates there were firmly held in check. So ended, at about ten o'clock at night, the second day's battle at Gettysburg , when nearly 40,000 men of the two armies, who were effective thirty-six hours before, were dead or wounded. The advantage seemed to be with the Confederates, for they held the ground in advance...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Gettysburg (Pennsylvania, United States) 7,452 224 1,368 10 0 user votes
Gettysburg (South Carolina, United States) 0 0 0 0 0 user votes
Gettysburg (South Dakota, 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.