Statistics for occurrence #1 of “Major, Surgeon” in chapter 5 of Thomas Wentworth Higginson, Massachusetts in the Army and Navy during the war of 1861-1865, vol. 2:

... Transferred to 29th Mass. Infantry, June 9, 1865. Mustered out, July 29, 1865. First Lieutenant, Assistant Surgeon, 40th Mass. Infantry, Sept. 2, 1862. Resigned, July 27, 1863. Major, Surgeon , 10th Mass. Infantry, June 21, 1861. Major, Surgeon, U. S. Volunteers, Apr. 13, 1863. See United States Army. First Lieutenant, Assistant Surgeon, 28th Mass. Infantry, Apr. 7, 1865. Mu...
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