Statistics for occurrence #1 of “Antietam, Md.” in chapter 45 of Thomas Wentworth Higginson, Massachusetts in the Army and Navy during the war of 1861-1865, vol. 1, Mass. officers and men who died.:

...Inf.,Cold Harbor, Va.,June 3, 1864. Hearn, Patrick,18th Mass. Inf.,Manassas, Va.,Aug. 30, 1862. Hearney, Charles,20th Mass. Inf.,Gettysburg, Pa.,July 3, 1863. Heath, John W., Corp.,15th Mass. Inf., Antietam, Md. ,Sept. 17, 1862. Heckox, Stephen W.,10th Mass. Inf.,Wilderness, Va.,May 5, 1864. Hefferman, Edward,3d Mass. Cav.,Fisher's Hill, Va.,Sept. 22, 1864.
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