Headquarters

Guards And Orderlies

Captain James B. McIntyre

Sturgis (Illinois) Rifles

Captain James Steele

McClellan Dragoons (Illinois)

Oneida (New York) Cavalry Company

Captain Daniel P. Mann

Headquarters Escort

4th United States Cavalry, Cos. A & E

Captain James B. McIntyre

Headquarters Escort

1st United States Cavalry , Cos. BCH&I

Captain Marcus A. Reno

Quartermaster's Guard

Provost Guard

Major William H. Wood

93rd New York Infantry, Cos. AFH&K

Lt. Colonel Benjamin C. Butler

8th United States Infantry, Cos ADF&G

Captain Royal T. Frank

19th United States Infantry, Cos. G&H

Captain Edmund L. Smith (Company G)
Captain Henry S. Welton (Company H)

2nd United States Cavalry, Cos EFH&K

Captain George Gordon

Volunteer 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

from Defences Washington

Reserve Artillery

5th United States Artilery, Battery K

from 5th Corps, 2nd Div., Artilery

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