# Battle of Williamsburg order of battle: Union

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

* w = wounded
* mw = mortally wounded
* k = killed

## Army of the Potomac

MG George B. McClellan Commanding in the field: BG Edwin V. Sumner

### III Corps

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 Division   BG Joseph Hooker | 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 |
| Second Division   BG Joseph Hooker | 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) |
| Second Division   BG Joseph Hooker | 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 |
| Third Division   BG Philip Kearny | 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 Division   BG Philip Kearny | 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 |
| Third Division   BG Philip Kearny | 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

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 |
| First Division   BG Darius N. Couch | 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 |
| First Division   BG Darius N. Couch | 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 |
| First Division   BG Darius N. Couch | 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 Division   BG William F. Smith | 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 |
| Second Division   BG William F. Smith | 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 |
| Second Division   BG William F. Smith | 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 |
| Third Division   BG Silas Casey | 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 Division   BG Silas Casey | 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 |
| Third Division   BG Silas Casey | 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 Philip St. George Cooke | 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 |