Statistics for occurrence #1 of “O'Brien, Jeremiah” 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, 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, Jeremiah,24th Mass. Inf.,Drewry's Bluff, Va.,May 16, 1864. O'Brien, John,9th Mass. Inf.,Gaines' Mill, Va.,June 27, 1862.
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