Statistics for occurrence #1 of “Forts Jackson” in page 218 of Admiral David D. Porter, The Naval History of the Civil War.:

...ext" xmlns="http://www.w3.org/TR/xhtml1/strict">view. The place I selected for the mortar vessels was under the lee of a thick wood closely interwoven with vines, and presenting in the direction of Forts Jackson and St. Philip an impenetrable mass for three hundred yards, through which shot could scarcely pass. From our mast-heads the forts could be plainly seen, though observers there could not see us in ...
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