5th Maine Volunteer Infantry (Col. Jackson and the 5th Maine went on to serve with distinction.)
Source: Geo. W. Bicknell, History of the Fifth Regiment Maine Volunteers (Portland, Maine: Hall L. Davis, 1871), 50 – 57,
https://ia801601.us.archive.org/33/items/historyoffifthre00bick/historyoffifthre00bick.pdf