Statistics for occurrence #1 of “Forts Beauregard” in chapter 34 of Admiral David D. Porter, The Naval History of the Civil War.:

...been ordered to take the same position. The abandonment of Tybee Island, on which there is a strong Martello tower, with a battery at its base, is due to the terror inspired by the bombardment of Forts Beauregard and Walker, and is a direct fruit of the victory of the 7th inst. By the fall of Tybee Island, the reduction of Fort Pulaski, which is within easy mortar distance, becomes only a question of time...
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