Statistics for occurrence #1 of “General Grant” in chapter 26 of Admiral David D. Porter, The Naval History of the Civil War.:

... by nature the strongest point on the river, but art had rendered it almost impregnable. It was very certain even in the early part of February,that this was to be a long and tiresome siege, and so General Grant viewed it. A naval contingent could not do more than give protection to the Army, which was very important; but as to the vessels alone possessing the power to knock down these inaccessible forts...
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