Statistics for occurrence #1 of “Colonel Shaw” in chapter 15 of Thomas Wentworth Higginson, Army Life in a Black Regiment:

... Recruiting for the Fifty-Fourth Massachusetts (colored) began on February 9, 1863, and the first squad went into camp at Readville, Massachusetts, on February 21, 1863, numbering twenty-five men. Colonel Shaw 's commission (and probably his muster) was dated April 17, 1863. (Roport of Adjutant-General of Massachusetts for 1863, pp. 896--899.) These were the earliest colored regiments, so far as I kn...
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