| Organized from the 3rd, 4th and 5th Regiments, South Carolina Colored Infantry, March 14, 1864. Attached to the 3rd Brigade, Vogdes' Division, District of Florida, Department of the South, to April, 1864. Morris Island, S.C., Northern District, Department of the South, to October, 1864. 1st Separate Brigade, Department of the South, to February, 1865. Garrison of Charleston, S.C., Department of the South, to August 1865. Department of the South, to October, 1865. SERVICE - Duty at Jacksonville, Florida, until April, 1864. Moved to Hilton Head, S.C., then to Folly Island, S.C., April 18. Duty on Folly Island, Morris Island and Coles Island, operating against Charleston, S.C., June 30 - July 10. Action on James Island, July 2. Occupation of Charleston and Mt. Pleasant, S.C., until August, 1865., and at various points in South Carolina and Georgia until October, 1866. Mustered out, [April 25, 1866]. |
| Officers of the 21st USCT Regiment Colonel Milton S. Littlefield Lieutenant Colonel Augustus G. Bennett Major Richard H. Willoughby Captain Edgar Abeel Mahlon E. Davis Joseph W. Dickinson Edmond R. Fowler Nicholas Mitz John L. Poppe Brantley G. Read Henry Sharp Charles Silva Henry V. Stonehouse First Lieutenant Charles S. Allen Adolphe Bessie Wm. G. Cornwell Charles A Dow William H. Fish Richard Gowers Alexander Hay George Hopper John E. Jacobs Adrianus Jansen Henry M. Jones Robert McLavy Daniel George McMartin Charles F. Richards Thomas J. Robinson George W. Wood Second Lieutenant Albert B. Ashley Addison Blanchard Charles F. Chase Oscar L. Cook George Durfee Hiram O. Edgerly Francis A.O. Grabner Joseph B. Holmes Prince Jenkins Peter Meagher James R. Rathbun P.H. Warren Surgeon John M. Hawks Assistant Surgeon James F. Burdett Nathan S. Roberts Chaplain Erasmus K. Jones Adjutant Edwin Slack |
| Organization of the 21st USCT |