Friday, July 25, 1862
Colonel William Lee was reassigned to assist Massachusetts Governor John Andrew in the recruiting effort, assigned to Camp John E. Wool in Worcester. Lee contracted malaria at Harrison's Landing, and was too weak to resume command of the Twentieth Massachusetts. Charles Peirson returned from assignment on General John Sedgwick's staff to his former role as adjutant of the regiment.1
1George A. Bruce, The Twentieth Regiment of Massachusetts Volunteer Infantry 1861 - 1865 (Cambridge, Massachusetts: The Riverside Press, 1906), 139.