The following Union Army unitsMultiple commander names indicate command succession of command during the battle or the campaign. 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 w = wounded mw = mortally wounded k = killed
Army of the Potomac
MG George B. McClellan
Chief of Staff: Col Randolph B. Marcy
DivisionBrigade Regiments and OthersGeneral 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 U.S. Engineer Battalion (3 companies): Cpt James C. Duane
II Corps
BG Edwin V. Sumner
DivisionBrigade Regiments and OthersFirst 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:Attached to 15th Massachusetts Cpt John Saunders 2nd Company, Minnesota Sharpshooters:Attached to 1st Minnesota 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
BG Samuel P. HeintzelmanKearny'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.
DivisionBrigade Regiments and OthersSecond 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. PattersonTurned over command to Col. Starr on June 1 due to illness.
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. EakinThird 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. BirneyUnder arrest May 31, brigade commanded by Col. Ward during the battle.
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
BG Erasmus D. Keyes
DivisionBrigade Regiments and OthersFirst 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
BG Fitz John Porter
DivisionBrigade Regiments and OthersFirst 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:Attached to 22nd Massachusetts 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:Attached to 16th Michigan 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 BerdanSecond 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
BG William B. Franklin
DivisionBrigade Regiments and OthersFirst 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. ArtillerySecond 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
DivisionBrigade Regiments and OthersCavalry Reserve
BG Philip St. George Cooke 1st Brigade
BG William H. Emory 5th U.S. Cavalry 6th U.S. Cavalry 6th Pennsylvania Cavalry 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
Notes
Sources Sears, Stephen W. To the Gates of Richmond: The Peninsula Campaign. New York: Ticknor & Fields, 1992. .