Statistics for occurrence #1 of “Fort McAllister” 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.:

...work of countermining, which, from that time on, was pushed energetically, until ample protection was afforded at all points Digging out the guns was an every-morning duty of the garrison in Fort McAllister , defending Savannah, during the three bombardments of the Federal monitors and gunboats--January 27, February 1, and March 3, 1863. Every night the cannon in the Fort became buried with dirt thrown...
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Entity Corpus Doc Corpus Doc  
Fort McAllister (Georgia, United States) 926 4 28 0 0 user votes

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