Statistics for occurrence #1 of “Tybee Island” in chapter 8 of Admiral David D. Porter, The Naval History of the Civil War.:
...to guard the harbors and inlets, Dupont returned to Port Royal in the Wabash.
Dupont found that during his absence from Port Royal, the Army had planted batteries of rifled guns and Columbiads on Tybee Island for the purpose of reducing Fort Pulaski: but as this was purely a military operation, the Flag Officer did not claim to interfere, although General Hunter permitted the Navy to take part in the bomb...
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