Statistics for occurrence #1 of “Forts Jackson” in chapter 52 of Admiral David D. Porter, The Naval History of the Civil War.:

...he enemy's works, which was to almost silence them. In regard to the damage done, it is, under the circumstances, impossible for any one to tell without a closer inspection, for, as you remember at Forts Jackson and St. Philip, everything from the outside seemed in status quo, hardly any trace of injury was apparent; but on entering and looking around, the terrible effect of the bombardment was manifest at e...
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