Statistics for occurrence #1 of “Mississippi River” in chapter 3 of Admiral David D. Porter, The Naval History of the Civil War.:

...ern coast, including also all needful naval aid to the Army in cutting off communication with the rebels. Besides this it was seen at an early date that a large naval force would be required on the Mississippi River and its tributaries. Third. There had to be provided a suitable number of swift vessels for the active pursuit of the Confederate cruisers, which might elude the vigilance of our blockading for...
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