Statistics for occurrence #1 of “Pennsylvania” in entry fair-oaks-or-seven-pines-battle-of of Harper's Encyclopedia of United States History:

...le past noon, May 31, when a most sanguinary battle ensued. Very soon the Confederates gained a position on Casey's flanks, when they were driven back to the woods by a spirited bayonet charge by Pennsylvania , New York, and Maine troops, led by General Naglee. Out of the woods immediately the Confederates swarmed in great numbers, and the battle raged more fiercely than ever. The Nationals fell back...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Pennsylvania (Pennsylvania, United States) 12,690 1,788 2 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.