Statistics for occurrence #1 of “forts Jackson” in chapter 18 of Admiral David D. Porter, The Naval History of the Civil War.:

...eir appearance in the Mississippi. forts Jackson and St. Philip. confidence of Confederates in the defense of New Orleans. obstructions. Confederate fleet. Porter's mortar fleet. bombardment of forts Jackson and St. Philip. terrible work of mortar fleet. the chains cut. passage of forts by war vessels. order of vessels in passing. desperate naval battle. the Varuna sunk after a gallant fight. the ...
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