Statistics for occurrence #1 of “Col.” in chapter 14, page 269 of Thomas Wentworth Higginson, Army Life in a Black Regiment:

... John D. Strong, Promotion, July 28, 1863; Resigned, Aug. 15, 1864. Chas. T. Trowbridge, Promotion, Dec. 9, 1864; Mustered out, &c. John D. Strong, Civil Life, Oct. 21, 1862; Lt.- Col. , July 28, 1863. Chas. T. Trowbridge, Promotion, Aug. 11, 1863; Lt.-Col., Dec. 9, 1864. H. A. Whitney, Promotion, Dec. 9, 1864; Mustered out, &c. Seth Rogers, Civil Life, Dec. 2, ...
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