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

... 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, and the whole coast of Texas brought under control. This was a large field of naval operations, seldom equalled in the history of war, and never exceeded, as fa...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Grand Gulf (Mississippi, United States) 858 86 40 0 0 user votes
Grand Gulf (Missouri, United States) 0 0 0 0 0 user votes

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