Battle of Seven Pines order of battle: Union explained

The following Union Army units^[1] and commanders fought in the Battle of Seven Pines on May 31 and June 1, 1862. 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

Other

Army of the Potomac

See main article: Army of the Potomac. MG George B. McClellan

Chief of Staff: Col Randolph B. Marcy

Division	Brigade	Regiments and Others
General Headquarters Maj Granville O. Haller	Headquarter & Body Guards	4th U.S. Cavalry (2 companies) Sturgis Rifles (Illinois) Oneida (New York) Cavalry
	Provost Guards	2nd U.S. Cavalry 8th U.S. (2 companies)
		93rd New York (4 companies) McClellan Dragoons (Illinois)
Chief of Engineers BG John G. Barnard	Volunteer Engineer Brigade BG Daniel P. Woodbury	15th New York Engineers 50th New York Engineers
Chief of Engineers BG John G. Barnard		U.S. Engineer Battalion (3 companies): Cpt James C. Duane

II Corps

See main article: II Corps (Union Army). BG Edwin V. Sumner

Division	Brigade	Regiments and Others
First Division BG Israel B. Richardson	1st Brigade BG Oliver O. Howard (w) Col Thomas J. Parker	5th New Hampshire: Col Edward E. Cross (w), Ltc Samuel G. Langley 61st New York: Col Francis C. Barlow, Ltc William Massett (k) 64th New York: Ltc Daniel C. Bingham (w) 81st Pennsylvania: Col James Miller (k), Ltc Charles F. Johnson
	2nd Brigade BG Thomas F. Meagher	63rd New York: Col John Burke 69th New York: Col Robert Nugent 88th New York: Ltc Patrick Kelly
	3rd Brigade BG William H. French	52nd New York: Col Paul Frank 57th New York: Col Samuel K. Zook 66th New York: Col Joseph C. Pinckney 53rd Pennsylvania: Col John R. Brooke, Maj Thomas Yeager (k)
	Artillery Cpt George W. Hazzard	Battery B, 1st New York Light Artillery: Cpt Rufus D. Pettit Battery G, 1st New York Light Artillery: Cpt John D. Frank Battery A & Battery C, 4th U.S. Artillery: Cpt George W. Hazzard
	Cavalry	6th New York Cavalry (Co. D)
Second Division BG John Sedgwick	1st Brigade BG Willis A. Gorman	15th Massachusetts: Col John W. Kimball 1st Minnesota: Col Alfred Sully 34th New York: Col James A. Suiter 82nd New York: Ltc Henry W. Hudson 1st Company, Massachusetts Sharpshooters:^[2] Cpt John Saunders 2nd Company, Minnesota Sharpshooters:^[3] Cpt William F. Russell
	2nd Brigade BG William W. Burns	69th Pennsylvania: Col Joshua T. Owen 71st Pennsylvania: Maj Charles W. Smith 72nd Pennsylvania: Col De Witt C. Baxter 106th Pennsylvania: Col Turner G. Morehead
	3rd Brigade BG Napoleon J.T. Dana	19th Massachusetts: Col Edward W. Hinks 20th Massachusetts: Col W. Raymond Lee 7th Michigan: Col Ira R. Grosvenor, Maj John H. Richardson 42nd New York: Col Edmund C. Charles
	Artillery Col Charles H. Tompkins	Battery A, 1st Rhode Island Light Artillery: Cpt John A. Tompkins Battery B, 1st Rhode Island Light Artillery: Cpt Walter O. Bartlett Battery G, 1st Rhode Island Light Artillery: Cpt Charles D. Owen Battery I, 1st U.S. Artillery: Lt Edmund Kirby
	Cavalry	6th New York Cavalry (Co. K): Cpt Riley Johnston

III Corps

See main article: III Corps (Union Army). BG Samuel P. Heintzelman^[4]

Division	Brigade	Regiments and Others
Second Division BG Joseph Hooker	1st Brigade BG Cuvier Grover	1st Massachusetts: Maj Charles P. Chandler 11th Massachusetts: Ltc Porter D. Tripp 2nd New Hampshire: Col Gilman Marston 26th Pennsylvania: Maj Casper M. Berry
	2nd Brigade BG Daniel Sickles	70th New York: Maj Thomas Holt 71st New York: Col George B. Hall 72nd New York: Col Nelson Taylor 73rd New York: Maj John D. Moriarty, Cpt Charles B. Elliot 74th New York: Col Charles K. Graham
	3rd Brigade BG Francis E. Patterson^[5] Col Samuel H. Starr	5th New Jersey: Col Samuel H. Starr 6th New Jersey: Col Gershom Mott 7th New Jersey: Col Joseph W. Revere 8th New Jersey: Col Adolphus J. Johnson
	Artillery Maj Charles S. Wainwright	Battery D, 1st New York Light Artillery: Cpt Thomas W. Osborn 4th New York Independent Battery: Cpt James E. Smith 6th New York Independent Battery: Cpt Walter M. Bramhall Battery H, 1st U.S. Artillery: Lt Charles R. Eakin
Third Division BG Philip Kearny	1st Brigade BG Charles D. Jameson (w)	87th New York: Col Stephen A. Dodge (w), Ltc Richard A. Bachia 57th Pennsylvania: Col Charles T. Campbell (w), Ltc E. W. Woods, Maj Jeremiah Culp (k) 63rd Pennsylvania: Col Alexander Hays, Ltc Algernon S. M. Morgan (w) 105th Pennsylvania: Col Amor A. McKnight (w)
	2nd Brigade BG David B. Birney^[6] Col J. H. Hobart Ward	3rd Maine: Col Henry G. Staples 4th Maine: Col Elijah Walker 38th New York: Col J. H. Hobart Ward 40th New York: Col Edward J. Riley (w), Ltc Thomas W. Egan
	3rd Brigade BG Hiram G. Berry	2nd Michigan: Col Orlando M. Poe, Ltc Adolphus Williams (w) 3rd Michigan: Col Stephen G. Champlin (w) 5th Michigan: Col Henry D. Terry 37th New York: Col Samuel B. Hayman
	Artillery Cpt James Thompson	Battery B, New Jersey Light Artillery: Cpt Adoniram J. Clark Battery E, 1st Rhode Island Light Artillery: Lt John K. Bucklyn Battery G, 2nd U.S. Artillery: Lt John H. Butler
	Cavalry	3rd Pennsylvania Cavalry: Col William W. Averell

IV Corps

See main article: IV Corps (Union Army). BG Erasmus D. Keyes

Division	Brigade	Regiments and Others
First Division BG Darius N. Couch	1st Brigade BG John J. Peck	55th New York: Ltc Louis Thourot 62nd New York: Col J. Lafayette Riker (k), Ltc David J. Nevin 93rd Pennsylvania: Col J. M. McCarter (w), Cpt John E. Arthur 102nd Pennsylvania: Col Thomas A. Rowley (w), Ltc J. M. Kinkead
	2nd Brigade BG John J. Abercrombie	65th New York: Col John Cochrane 67th New York: Col Julius W. Adams (w), Ltc Nelson Cross 23rd Pennsylvania: Col Thomas H. Neill, Ltc John Ely (w) 61st Pennsylvania: Col Oliver H. Rippey (k), Cpt Robert L. Orr 82d Pennsylvania: Col David H. Williams
	3rd Brigade BG Charles Devens (w) Col Charles H. Innes	7th Massachusetts: Col David A. Russell 10th Massachusetts: Col Henry S. Briggs (w), Cpt Orzo Miller 36th New York: Ltc D. E. Hungerford
	Artillery Maj Robert M. West	Battery C, 1st Pennsylvania Light Artillery: Cpt Jeremiah McCarthy Battery D, 1st Pennsylvania Light Artillery: Cpt Edward H. Flood Battery E, 1st Pennsylvania Light Artillery: Cpt Theodore Miller Battery H, 1st Pennsylvania Light Artillery: Cpt James Brady
	Cavalry	6th New York Cavalry (Co. F)
Third Division BG Silas Casey	1st Brigade BG Henry M. Naglee	11th Maine: Col Harris M. Plaisted 56th New York: Ltc James Jourdan 100th New York: Col James M. Brown (k) 52nd Pennsylvania: Col John C. Dodge Jr. 104th Pennsylvania: Col W. W. H. Davis (w), Ltc John W. Nields (w), Maj John M. Gries (mw)
	2nd Brigade BG Henry W. Wessells	96th New York: Col James Fairman 85th Pennsylvania: Col Joshua B. Howell 101st Pennsylvania: Ltc David B. Morris (w) 103rd Pennsylvania: Maj A. W. Gazzam
	3rd Brigade BG Innis N. Palmer	81st New York: Ltc Jacob J. DeForest (w), Cpt W. C. Raulston 85th New York: Col Jonathan S. Belknap 92nd New York: Col Lewis C. Hunt (w), Ltc Hiram Anderson Jr. 98th New York: Ltc Charles Durkee
	Artillery Col Guilford D. Bailey (k) Maj D. H. Van Valkenburgh (k) Cpt Peter C. Regan	Battery A, 1st New York Light Artillery: Lt George P. Hart Battery H, 1st New York Light Artillery: Cpt Joseph Spratt (w), Lt Charles E. Mink 7th New York Independent Battery: Cpt Peter C. Regan 8th New York Independent Battery: Cpt Butler Fitch
	Cavalry	6th New York Cavalry (Co. B):
	Cavalry	8th Pennsylvania Cavalry: Col David M. Gregg

V Corps

See main article: V Corps (Union Army). BG Fitz John Porter

Division	Brigade	Regiments and Others
First Division BG George W. Morell	1st Brigade BG John H. Martindale	2nd Maine 18th Massachusetts 22nd Massachusetts 13th New York 25th New York 2nd Company, Massachusetts Sharpshooters:^[7]
	2nd Brigade Col James McQuade	9th Massachusetts 4th Michigan 14th New York 62nd Pennsylvania
	3rd Brigade BG Daniel Butterfield	16th Michigan 12th New York 17th New York 44th New York 83rd Pennsylvania Brady's Company, Michigan Sharpshooters:^[8]
	Artillery Cpt Charles Griffin	Battery C, Massachusetts Light Artillery Battery E, Massachusetts Light Artillery Battery C, 1st Rhode Island Light Artillery Battery D, 5th U.S. Artillery
	Sharpshooters	1st U.S. Sharpshooters: Col Hiram Berdan
Second Division BG George Sykes	1st Brigade Col Robert C. Buchanan	3rd U.S. 4th U.S. 12th U.S. 14th U.S.
	2nd Brigade Ltc William Chapman	2nd U.S. 6th U.S. 10th U.S. 11th U.S. 17th U.S.
	3rd Brigade Col Gouverneur K. Warren	5th New York 1st Connecticut Heavy Artillery (serving as infantry)
Artillery Reserve Col Henry J. Hunt	1st Brigade Ltc William Hays	Battery M, 2nd U.S. Artillery: Captain Henry Benson Battery C - G, 3rd U.S. Artillery
	2nd Brigade Ltc George W. Getty	Battery E, 1st U.S. Artillery: Lt Alanson Merwin Randol Battery G & K, 1st U.S. Artillery Battery G, 4th U.S. Artillery Battery A, 5th U.S. Artillery Battery K, 5th U.S. Artillery
	3rd Brigade Maj Albert Arndt	Battery A, 1st New York Artillery Battalion Battery B, 1st New York Artillery Battalion Battery C, 1st New York Artillery Battalion Battery D, 1st New York Artillery Battalion
	4th Brigade Cpt J. Howard Carlisle	Battery E, 2nd U.S. Artillery Battery F - K, 3rd U.S. Artillery Battery K, 4th U.S. Artillery

VI Corps

See main article: VI Corps (Union Army). BG William B. Franklin

Division	Brigade	Regiments and Others
First Division BG Henry W. Slocum	1st Brigade BG George W. Taylor	1st New Jersey 2nd New Jersey 3rd New Jersey 4th New Jersey
	2nd Brigade Col Joseph J. Bartlett	5th Maine 16th New York 27th New York 96th Pennsylvania
	3rd Brigade BG John Newton	18th New York 31st New York 32nd New York 95th Pennsylvania
	Artillery Cpt Edward R. Platt	Battery A, Massachusetts Light Artillery Battery A, New Jersey Light Artillery Battery D, 2nd U.S. Artillery
Second Division BG William F. Smith	1st Brigade BG Winfield S. Hancock	6th Maine 43rd New York 49th Pennsylvania 5th Wisconsin
	2nd Brigade BG William T. H. Brooks	2nd Vermont 3rd Vermont 4th Vermont 5th Vermont 6th Vermont
	3rd Brigade BG John W. Davidson	7th Maine 33rd New York 49th New York 77th New York
	Artillery Cpt Romeyn B. Ayres	Battery E, 1st New York Light Artillery 1st New York Independent Battery 3rd New York Independent Battery Battery F, 5th U.S. Artillery
	Cavalry	1st New York Cavalry

Reserves

Division	Brigade	Regiments and Others
Cavalry Reserve BG Philip St. George Cooke	1st Brigade BG William H. Emory	5th U.S. Cavalry 6th U.S. Cavalry 6th Pennsylvania Cavalry
Cavalry Reserve BG Philip St. George Cooke	2nd Brigade Col George A.H. Blake	1st U.S. Cavalry 8th Pennsylvania Cavalry
	Advance Guard BG George Stoneman	8th Illinois Cavalry 98th Pennsylvania 2nd Rhode Island Battery A, 2nd U.S. Artillery Batteries B and L, 2nd U.S. Artillery
	White House Command Ltc Rufus Ingalls	93rd New York (6 companies) 11th Pennsylvania Cavalry (5 companies) Battery F, 1st New York Light Artillery

Sources

Sears, Stephen W. To the Gates of Richmond: The Peninsula Campaign. New York: Ticknor & Fields, 1992. .
Web site: Richard. J.. The Armies at the Battle of Fair Oaks or Seven Pines. History of War. 27 January 2007. 3 February 2016.

Notes and References

Multiple commander names indicate command succession of command during the battle or the campaign.
Attached to 15th Massachusetts
Attached to 1st Minnesota
Kearny's artillery, the 3rd Pennsylvania Cavalry, the 6th and 7th New Jersey regiments, and Poe's brigade were guarding the bridges at White Oak Swamp and not engaged.
Turned over command to Col. Starr on June 1 due to illness.
Under arrest May 31, brigade commanded by Col. Ward during the battle.
Attached to 22nd Massachusetts
Attached to 16th Michigan