Statistics for occurrence #1 of “Captain Pierson” in page 78 of William Schouler, A history of Massachusetts in the Civil War: Volume 1:

..., drum-major. Several changes occurred while the regiment was in service. Colonel Greene, Major Keyes, and Adjutant Barri were appointed officers in the regular army. To fill these vacancies, Captain Pierson was elected lieutenant-colonel; Captain John T. Boyd, major; and Lieutenant John G. Chambers was appointed adjutant. The following is the roster of the companies:— Company A, Mechanic Lig...
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