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

...and Grand Gulf, which thus became two formidable barriers against the advance of the Navy. When Vicksburg was invested in 1863 by the Army under Major General Grant, and a large naval force under Rear-Admiral Porter , many efforts were made by the latter officer to send vessels down to blockade the mouth of the Red River, and thus cut off supplies from Port Hudson and Vicksburg; but, owing to casualties in the ve...
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