Statistics for occurrence #1 of “Gibraltar” in chapter 39 of Admiral David D. Porter, The Naval History of the Civil War.:

... New Orleans to co-operate with the Army in maintaining order in Louisiana. This omission of a proper military force to co-operate with the Navy gave the Confederates time to render Vicksburg the Gibraltar of the West, and for a long period it bade defiance to the Army and Navy combined. The Vicksburg miscarriage enabled the enemy to fortify Port Hudson and Grand Gulf, which thus became two formidabl...

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Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Gibraltar 126 2 0 0 0 user votes
Gibraltar (Pennsylvania, United States) 82 0 0 0 0 user votes
Gibraltar (California, United States) 12 0 0 0 0 user votes
Gibraltar (Washington, United States) 4 0 0 0 0 user votes
Gibraltar 2 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.