Statistics for occurrence #1 of “Mississippi River” in chapter 18 of Admiral David D. Porter, The Naval History of the Civil War.:

...anize and practice with them at that point. When these formidable mortars arrive, and you are completely ready, you will collect such vessels as can be spared from the blockade and proceed up the Mississippi River and reduce the defences which guard the approaches to New Orleans, when you will appear off that city and take possession of it under the guns of your squadron, and hoist the American flag therein, k...
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