Statistics for occurrence #1 of “Coehorn” in chapter 6, page 78 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.:
...onsisted of one 100-pounder Parrott en barbette, two 30-pounder Parrott en embrasure and one 30-pounder Parrott en barbette. It also contained two mortars, one 10-inch siege mortar and one 24-pounder Coehorn ....
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