Statistics for occurrence #1 of “Colonel Robert Williams” in chapter 12, page 134 of Thomas Wentworth Higginson, Harvard Memorial Biographies:

...n Virginia, in the faithful discharge of rather monotonous duty, until October 9, 1861, when he resigned, in order to accept the more congenial position of Captain in the First Massachusetts Cavalry ( Colonel Robert Williams ), to which he was commissioned on the last day of the same month. His elder brother, afterward Brevet Brigadier-General Horace Binney Sargent, was then Lieutenant-Colonel of the same regiment. ...
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