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

...ontas, are at anchor in the harbor abreast of Tybee beacon and light, and that the Savannah has 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 Isla...
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Martello (Italy) 18 4 0 0 0 user votes

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