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

...itions of war were poured in from Vicksburg, and the enemy were prepared to make a strong resistance to the gun-boats or to any assault from the land forces. Grand Gulf was by nature as strong as Vicksburg , the Confederates in their pride called it the Little Gibraltar. The principal work called Bald Head, was on a bold bluff promontory at a bend in the river commanding a view for miles up and down ...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Vicksburg (Mississippi, United States) 8,077 676 627 8 0 user votes
Vicksburg (Colorado, United States) 1 0 1 0 0 user votes
Vicksburg (Mississippi, United States) 1 0 1 0 0 user votes
Vicksburg (Arizona, United States) 0 0 0 0 0 user votes
Vicksburg (Florida, United States) 0 0 0 0 0 user votes
Vicksburg (Indiana, United States) 0 0 0 0 0 user votes
Vicksburg (Kentucky, United States) 0 0 0 0 0 user votes
Vicksburg (Michigan, United States) 0 0 0 0 0 user votes
Vicksburg (Missouri, United States) 0 0 0 0 0 user votes
Vicksburg (Pennsylvania, United States) 0 0 0 0 0 user votes
Vicksburg (Pennsylvania, 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.