Statistics for occurrence #1 of “Capt. M. H. Warren” in chapter 1, page 120 of Thomas Wentworth Higginson, Massachusetts in the Army and Navy during the war of 1861-1865, vol. 1: prelminary narrative:

...ldier, in Hancock's phrase. On earlier days of the prolonged conflict Lieut. G. B. Simonds of the 15th Mass. had fallen, with Lieuts. Edward Sturgess and L. E. Hibbard, of the 20th. On May 12 died Capt. M. H. Warren of the 1st Mass. Infantry and Lieut. J. J. Ferris of the 19th; on May 18 Maj. A. J. Lawler and Capts. James Magner and W. F. Cochrane of the 28th Mass. In the contest of the heavy artillery regiments...
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