Seven Days Battles order of battle: Union
Open-knowledge reference entry

The following Union Army units and commanders fought in the Seven Days Battles (from June 25 to July 1, 1862) of the American Civil War. Order of battle compiled from the army organization-return of casualties during the battle and the reports. The Confederate order of battle is listed separately.
Abbreviations used
Military rank
MG = Major General
BG = Brigadier General
Col = Colonel
Ltc = Lieutenant Colonel
Maj = Major
Cpt = Captain
Lt = Lieutenant
Sgt = Sergeant
Other
w = wounded
mw = mortally wounded
k = killed
c = captured
Army of the Potomac
MG George B. McClellan, Commanding
General Staff and Headquarters
General Staff
Chief of Staff: BG Randolph B. Marcy
Chief of Artillery: BG William F. Barry
Assistant Adjutant General: BG Seth Williams
Chief Quartermaster: BG Stewart L. Van Vliet
General Headquarters
Escort
Oneida (New York) Cavalry: Cpt James B. McIntyre
4th United States Cavalry (Companies A & E): Cpt James B. McIntyre
Provost Marshal General: BG Andrew Porter
McClellan Dragoons: Maj Alfred Pleasonton
Sturges' Rifles: Maj Granville O. Haller
93rd New York (Companies A, F, H, & K): Maj Granville O. Haller
2nd United States Cavalry: Maj Alfred Pleasonton
8th United States (Companies F & G): Cpt Royal T. Frank; Lt Eugene Carter
United States Engineers
Battalion United States Engineers: Cpt James C. Duane
Engineer Brigade: BG Daniel P. Woodbury
15th New York Engineers: Col John McLeod Murphy
50th New York Engineers: Col Charles B. Stuart
II Corps
BG Edwin V. Sumner
III Corps
BG Samuel P. Heintzelman (w - Glendale)
IV Corps
BG Erasmus D. Keyes
V Corps
BG Fitz J. Porter
VI Corps
BG William B. Franklin
Artillery Reserve
Col Henry J. Hunt
Cavalry Reserve
Casey's Command
Notes
References
U.S. War Department, The War of the Rebellion: a Compilation of the Official Records of the Union and Confederate Armies, U.S. Government Printing Office, 1880–1901.
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