Statistics for occurrence #1 of “Duffy, William” in chapter 29 of Thomas Wentworth Higginson, Massachusetts in the Army and Navy during the war of 1861-1865, vol. 1, Mass. officers and men who died.:

... 6, 1865. Duffy, John,4th Mass. Inf.,Port Hudson, La.,June 14, 1863. Duffy, Michael J.,22d Mass. Inf.,Malvern Hill, Va.,July 1, 1862. Duffy, Thomas,2d Mass. Inf.,Cedar Mountain, Va.,Aug. 9, 1862. Duffy, William ,16th Mass. Inf.,Wilderness, Va.,May 6, 1864. Dugan, Dennis,20th Mass. Inf.,Spotsylvania, Va.,May 12, 1864. Dugree, Charles,28th Mass. Inf.,Spotsylvania, Va.,May 18, 1864. Dumasey, William F.,2d Ma...
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