Statistics for occurrence #1 of “Port Royal” in chapter 54 of Admiral David D. Porter, The Naval History of the Civil War.:

...more active part than was perhaps ever before taken by naval forces, and though illy supplied with the proper kind of vessels, they seldom experienced reverses. There were the fights of Hatteras, Port Royal , New Orleans, Mobile, Vicksburg, and all along the Mississippi and its tributaries, Red River, Arkansas. White, Tennessee, Cumberland and Ohio Rivers, Grand Gulf, Port Hudson, Charleston, Galveston...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Port Royal (South Carolina, United States) 2,928 130 170 6 0 user votes
Port Royal (Jamaica) 4 0 4 0 0 user votes
Port Royal (Georgia, United States) 2 0 0 0 0 user votes
Port Royal (Alabama, United States) 0 0 0 0 0 user votes
Port Royal (Florida, United States) 0 0 0 0 0 user votes
Port Royal (Kentucky, United States) 0 0 0 0 0 user votes
Port Royal (Pennsylvania, United States) 0 0 0 0 0 user votes
Port Royal (Pennsylvania, United States) 0 0 0 0 0 user votes
Port Royal (Tennessee, 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.