Statistics for occurrence #1 of “Admiral David D. Porter” in chapter 13 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 5: Forts and Artillery.:

...eneral Lee to push on to Flat In 1864, a larger force than ever had assembled under one command in the history of the American navy was concentrated before Fort Fisher, North Carolina, under Admiral David D. Porter . Sixty vessels, of which five were ironclads, arrived in sight of the ramparts on the morning of December 20th. After a futile effort to damage the Fort by the explosion of the powder-boat Louisian...
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