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

...scarriage enabled the enemy to fortify Port Hudson 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 Hudso...
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