Statistics for occurrence #1 of “Coehorn” in chapter 6, page 97 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.:
... en barbette, two 12-pounder howitzers, six 30-pounder Parrotts, three 20-pounder Parrotts and three 10-pounder Parrotts, all en embrasure. It also mounted one 10-inch siege mortar and two 24-pounder Coehorn mortars. It overlooked the Leesburg and Georgetown Turnpike....
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† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.