Statistics for occurrence #1 of “Sergeants, John J. Powers” in chapter 11 of Brig.-Gen. Bradley T. Johnson, Confederate Military History, a library of Confederate States Military History: Volume 2.1, Maryland:

... C. Holohan, Algernon Henry, Patrick O'Connell. Corporals, Jas. E. Briddle, Henry A. Mumford, Wm. Lord, Benj. F. Twilley. Company H—Captain, J. Thos. Bussey. FirstSer-geant, Thos. O'Brien. Sergeants, John J. Powers . Corporals, Patrick Keenan, John J. Ward. Battles in which the Second Maryland regiment infantry was engaged: Winchester, Gettysburg, Cold Harbor, White Oak Swamp, Weldon Railroad, Squirrel Lev...
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