Statistics for occurrence #1 of “Mississippi River” in chapter 19 of Admiral David D. Porter, The Naval History of the Civil War.:

...easured as the ground-work of the history of the most important naval battle of modern times,--we do not think any excuse is needed for inserting them here. United States Flag-Ship Hartford, Mississippi River , April 2, 1862. Sir — We commenced the bombardment of Fort Jackson on the 16th, which was the earliest day possible after the arrival of coal. On the first day the citadel was set on fire...
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