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Guards & Orderlies  Captain James B. McIntyre
McClellan Dragoons (Illinois)
Sturgis (Illinois) Rifles
Oneida (New York) Cavalry Company Captain Daniel P. Mann
1st United States Cavalry, Cos. BCH&I Captain Marcus A. Reno
4th United States Cavalry, Cos. A & E Captain James B. McIntyre
Provost Guard Major William H. Wood
93rd New York Infantry, Cos. AFH&K Lt. Colonel Benjamin C. Butler
8th United States Infantry, Cos. ABDF&G Captain Royal T. Frank
19th United States Infantry Cos. G&H Captain Edmund L. Smith (Co. G)
Captain Henry S. Welton (Co. H)
2nd United States Cavalry Regiment Captain George Gordon
Engineer Brigade Brigadier General Daniel Woodbury
15th New York Engineer Regiment Colonel John M. Murphy
50th New York Engineer Regiment Lieutenant Colonel William H. Pettes
Regular Engineer Battalion Captain James C. Duane
Siege Artillery
1st Connecticut Heavy Artillery, AB&M Brigadier General Randolph B. Marcy  from Defences Washington
Reserve Artillery
5th United States Artilery, Battery K from 5 Corps, 2 Div.
Headquarters Staff
Chief of Staff Brigadier General Randolph B. Marcy
Chief of Artillery Brigadier General Henry J. Hunt
Chief of Cavalry Brigadier General John Buford
Chief Engineer Captain James C. Duane
Inspector General Colonel Delos B. Sacket
Assistant Adjutant General Lieutenant Colonel Albert V. Coburn
Chief Quartermaster Lieutenant Colonel Rufus Ingalls
Topographer Captain Charles R. Lowell
Medical Director Surgeon Jonathan Letterman
Chief of Signals Major Albert J. Meyer