Statistics for occurrence #1 of “General Grant” in chapter 57 of Admiral David D. Porter, The Naval History of the Civil War.:

... four heavy iron-clads in utter uselessness. If those vessels could reach City Point they would commit great havoc — as they came near doing while I was away at Fort Fisher. In consequence, General Grant ordered the channel to be still further obstructed with stones, so that no vessel can pass. We can hold the fort with a very small force and prevent any one from removing the obstructions. Theref...
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