. . . "Union" . . . . . . . "Army of the Ohio" . . . . . "1846Z"^^ . . . . "John Gray Foster (May 27, 1823 \u2013 September 2, 1874) was a career military officer in the United States Army and a Union general during the American Civil War whose most distinguished services were in North and South Carolina. A postbellum expert in underwater demolition, he wrote the definitive treatise on the subject in 1869."@en . . . "Department of the South" . . "XVIII Corps" . . "Department of North Carolina" . . "John Gray Foster"@en . "1874Z"^^ . .