Statistics for occurrence #1 of “Lieutenant-Colonel A. G. O'Brien” in chapter 3, section c.3.16 of Southern Historical Society Papers, Volume 12.:

... Tenth Georgia, Colonel W. C. Holt. Fiftieth Georgia, Colonel P. McGlashan. Fifty-first Georgia, Colonel E. Ball. Fifty-third Georgia, Colonel James P. Simms. Thirteenth Mississippi, Lieutenant-Colonel A. G. O'Brien . Seventeenth Mississippi, Captain J. C. Cochran. Eighteenth Mississippi, Colonel T. M. Griffin. Twenty-first Mississippi, Colonel D. N. Moody. Second South Carolina, Colonel J. D. Kennedy...
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