Battle of Williamsburg order of battle: Union explained

The following United States Army units and commanders fought in the Battle of Williamsburg of the American Civil War. The Confederate order of battle is shown separately.

Abbreviations used

Military rank

MG = Major General
BG = Brigadier General
Col = Colonel
Ltc = Lieutenant Colonel
Maj = Major
Cpt = Captain
Lt = Lieutenant
Bvt = Brevet

Other

Army of the Potomac

See main article: Army of the Potomac. MG George B. McClellan
Commanding in the field: BG Edwin V. Sumner

III Corps

See main article: III Corps (Union Army). BG Samuel P. Heintzelman

Division	Brigade	Regiments and Others
Second Division BG Joseph Hooker	First Brigade BG Cuvier Grover	2nd New Hampshire: Gilman Marston 1st Massachusetts: Col Robert Cowdin 11th Massachusetts: Col William E. Blaisdell 26th Pennsylvania: Col William F. Small (w), Maj Casper M. Berry
	Second Brigade Col Nelson Taylor	70th New York: Col William Dwight (w&c), Maj Thomas Hold 72nd New York: Ltc Israel Moses 73rd New York: Col William R. Brewster 74th New York: Ltc Charles H. Burtis
	Third Brigade BG Francis E. Patterson	5th New Jersey: Col Samuel H. Starr 6th New Jersey: Ltc John P. Van Leer (k), Maj George C. Burling 7th New Jersey: Ltc Ezra A. Carman (w), Maj Francis Price, Jr. 8th New Jersey: Col Adolphus J. Johnston (w), Maj Peter H. Ryerson (k)
	Artillery Maj Charles S. Wainwright	Battery D, 1st New York Artillery: Cpt Thomas W. Osborn 4th New York Battery: Cpt James E. Smith 6th New York Battery: Cpt Walter M. Bramhal Battery H, 1st United States Artillery: Cpt Charles H. Webber
Third Division BG Philip Kearny	First Brigade BG Charles Davis Jameson	57th Pennsylvania: Col Charles T. Campbell 63rd Pennsylvania: Col Alexander Hays 105th Pennsylvania: Col Amor A. McKnight 87th New York: Col Stephen A. Dodge
	Second Brigade BG David B. Birney	38th New York: Col J. H. Hobart Ward 40th New York: Col Edward J. Riley 3rd Maine: Col Henry G. Staples 4th Maine: Col Elijah Walker
	Third Brigade BG Hiram G. Berry	2nd Michigan: Col Orlando M. Poe 3rd Michigan: Col Stephen G. Champlin 5th Michigan: Col Henry D. Terry 37th New York: Col Samuel B. Hayman
	Artillery Cpt James Thompson	Battery B, 1st New Jersey Light Artillery: Cpt John E. Beam Battery E, 1st Rhode Island Light Artillery: Cpt George E. Randolph Battery G, 2nd U.S. Artillery: Cpt James Thompson

IV Corps

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

Division	Brigade	Regiments and Others
First Division BG Darius N. Couch	First Brigade BG Charles Devens	7th Massachusetts: Col David A. Russell 10th Massachusetts: Col Henry S. Briggs 2nd Rhode Island: Col Frank Wheaton 36th New York
	Second Brigade BG Lawrence P. Graham	23rd Pennsylvania: Col Thomas H. Neill 31st Pennsylvania: Col David H. Williams 61st Pennsylvania: Col Oliver H. Rippey 65th New York: Ltc Alexander Shaler 67th New York: Ltc Nelson Cross
	Third Brigade BG John J. Peck	55th New York: Col P. Regis de Trobriand 62nd New York: Col John L. Riker 93rd Pennsylvania: Col James M. McCarter 98th Pennsylvania: Col John F. Ballier 102nd Pennsylvania: Col Thomas Algeo Rowley
	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
Second Division BG William F. Smith	First Brigade BG Winfield S. Hancock	5th Wisconsin: Col Amasa Cobb 6th Maine: Col Hiram Burnham 43rd New York: Col Francis L. Vinton 49th Pennsylvania: Col William H. Irwin
	Second Brigade BG William T. H. Brooks	2nd Vermont: Col Henry Whitting 3rd Vermont: Col Breed N. Hyde 4th Vermont: Col Edwin H. Stoughton 5th Vermont: Ltc Lewis A. Grant 6th Vermont: Ltc Nathan Lord
	Third Brigade BG John Davidson	7th Maine: Col Edwin C. Mason 33rd New York: Col Robert F. Taylor 49th New York: Col Daniel D. Bidwell 77th New York: Col James B. McKean
	Artillery Cpt Romeyn B. Ayres	1st New York Battery: Lt Andrew Cowan 3rd New York Battery: Cpt Thaddeus P. Mott Battery E, 1st New York Light Artillery: Cpt Charles C. Wheeler Battery F, 5th U.S. Artillery: Cpt Romeyn B. Ayres
Third Division BG Silas Casey	First Brigade BG Henry Morris Naglee	52nd Pennsylvania: Col John C. Dodge, Jr. 104th Pennsylvania: Col William W. H. Davis 56th New York: Col Charles H. Van Wyck 100th New York: Col James M. Brown 11th Maine: Col John C. Caldwell
	Second Brigade BG William H. Keim	96th New York: Ltc Charles O. Gray 85th Pennsylvania: Col Joshua B. Howell 101st Pennsylvania: Col Joseph H. Wilson 103rd Pennsylvania: Maj Audley W. Gazzon
	Third Brigade BG Innis N. Palmer	81st New York: Ltc Jacob J. De Forest 85th New York: Col Jonathan S. Belknap 92nd New York: Ltc Hiram Anderson, Jr. 93rd New York: Ltc Benjamin C. Butler 98th New York: Col William Dutton
	Artillery Col Guilford D. Bailey	7th New York Battery: Cpt Peter C. Regan 8th New York Battery: Cpt Butler Fitch Battery A, 1st New York Artillery: Cpt Thomas H. Bates Battery H, 1st New York Artillery: Cpt Joseph Spratt
	Cavalry	5th U.S. Cavalry: Maj Joseph H. Whittlesey

Cavalry Advanced Guard

BG George Stoneman

Brigade	Regiments and Others
Cooke's Brigade BG	1st U.S. Cavalry: Ltc William N. Grier 6th U.S. Cavalry: Maj Lawrence Williams
First Brigade BG William H. Emory	3rd Pennsylvania Cavalry: Col William W. Averell 8th Illinois Cavalry: Col John F. Farnsworth McClellan Dragoons: Maj Charles W. Barker
Artillery Ltc William Hays	Batteries B and L, 2nd U.S. Artillery: Cpt James M. Robertson Battery M, 2nd U.S. Artillery: Cpt Henry Benson Battery C, 3rd U.S. Artillery: Cpt Horatio G. Gibson Battery K, 3rd U.S. Artillery: Cpt John C. Tidball

References

Hastings, Earl C. and David S. Hastings. A Pitiless Rain: The Battle of Williamsburg, 1862. Shippensburg, Pennsylvania; White Mane Publishing Company, 1997.
Web site: Richard. J.. The Armies at the Battle of Williamsburg, 5 May 1862. History of War. 20 June 2007. 2 February 2016.
Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War, Volume 2 (Pdf), New York: The Century Co., 1887.