Statistics for occurrence #1 of “Lieutenant-Colonel John C. Whiton” in chapter 10, page 556 of William Schouler, A history of Massachusetts in the Civil War: Volume 1:
...illiam F. Bartlett, was organized at Camp Wool, Worcester, and was sent forward April 18.
The Fifty-eighth, nine companies, was recruited at Readville, and was sent to the front, under command of Lieutenant-Colonel John C. Whiton , April 28.
The Fifty-ninth was recruited at Readville, by Colonel Jacob P. Gould.
It left the State April 26.
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