Statistics for occurrence #1 of “Grand Gulf” in chapter 28 of Admiral David D. Porter, The Naval History of the Civil War.:

...passed since the reconnoissance of Grand Gulf by the Admiral and time was lost which could never be regained. The Confederates concluded from the reconnoissance that measures were on foot to attack Grand Gulf , and they worked incessantly to strengthen the defences. Men and munitions of war were poured in from Vicksburg, and the enemy were prepared to make a strong resistance to the gun-boats or to any a...
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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