Statistics for occurrence #1 of “Coehorn” in chapter 6 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.:
...bette, four 4 1/2-inch rifles en embrasure, two 4 1/2-inch rifles en barbette, and six 6-pounder James rifles en embrasure. It also boasted three mortars, one 10-inch siege-mortar, and two 24-pounder Coehorn s, and there were thirteen vacant platforms for field and siege-guns.
The terrain on which the work was placed was such as to enable it to shelter a large body of troops with natural cover.
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