Statistics for occurrence #1 of “O'Brien, James” in chapter 74 of Thomas Wentworth Higginson, Massachusetts in the Army and Navy during the war of 1861-1865, vol. 1, Mass. officers and men who died.:

... O'Brien, Daniel,20th Mass. Inf.,Fredericksburg, Va.,Dec. 11, 1862. O'Brien, Edward J.,29th Mass. Inf.,Petersburg, Va.,March 25, 1865. O'Brien, James,20th Mass. Inf.,Gettysburg, Pa.,July 2, 1863. O'Brien, James , Lieut. Col.,48th Mass. Inf.,Port Hudson, La.,May 27, 1863. O'Brien, James,12th Mass. Inf.,Antietam, Md.,Sept. 17, 1862. O'Brien, Jeremiah,22d Mass. Inf.,Gaines' Mill, Va.,June 27, 1862. O'Brien, ...
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