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Battle of Williamsburg
Union Order of Battle

Maj. Gen. George B. McClellan

Army of the Potomac

Brig. Gen. Edwin V. Sumner, Second in Command

III Army Corps

Brig. Gen. Samuel P. Heintzelman

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2nd Division

Brig. Gen. Joseph Hooker

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1st Brigade

Brig. Gen. Cuvier Grover

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1st Massachusetts

Col. Robert Cowdin

11th Massachusetts

Col. William Blaisdell

2nd New Hampshire

Col. Gilman Marston

26th Pennsylvania

Col. William F. Small (w)

Maj. Casper M. Berry

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2nd Brigade

Col. Nelson Taylor

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70th New York

Col. William Dwight, Jr. (w,c)

Maj. Thomas Holt

72nd New York

Lieut. Col. Israel Moses

73rd New York

Col. William R. Brewster

74th New York

Lieut. Col. Charles H. Burtis

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3rd Brigade

Brig. Gen. Francis E. Patterson

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5th New Jersey

Col. Samuel H. Starr

6th New Jersey

Lieut. Col. John P. Van Leer (k)

Maj. George C. Burling

7th New Jersey

Lieut. Col. Ezra A. Carman (w)

Maj. Francis Price Jr.

8th New Jersey

Col. Adolphus J. Johnson (w)

Maj. Peter H. Ryerson (k)

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Artillery

Maj. Charles S. Wainwright

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1st New York

Capt. Thomas W. Osborn

4th New York

Capt. James E. Smith

6th New York

Capt. Walter M. Bramhall

Battery H, 1st U.S. Artillery

Capt. Charles H. Webber

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3rd Division

Brig. Gen. Philip Kearny

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1st Brigade

Brig. Gen. Charles D. Jameson

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87th New York

Col. Stephen A. Dodge

57th Pennsylvania

Col. Charles T. Campbell

63rd Pennsylvania

Col. Alexander Hays

105th Pennsylvania

Col. Amor A. McKnight

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2nd Brigade

Brig. Gen. David B. Birney

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3rd Maine

Col. Henry G. Staples

4th Maine

Col. Elijah Walker

38th New York

Col. J. H. Hobart

40th New York

Col. Edward J. Riley

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3rd Brigade

Brig. Gen. Hiram G. Berry

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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

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Artillery

Capt. James Thompson

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Battery B, 1st New Jersey

Capt. John E. Beam

Battery E, 1st Rhode Island

Capt. George E. Randolph

Battery G, 2nd U.S. Artillery

Capt. James Thompson

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IV Army Corps

Brig. Gen. Erasmus D. Keyes

5th U.S. Cavaalry

Maj. Joseph H. Whittlesey

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1st Division

Brig. Gen. Darius N. Couch

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1st Brigade

Col. Julius W. Adams

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65th New York (1st U.S. Chasseurs)

Lieut. Col. Alexander Shaler

67th New York (Long Island)

Lieut. Col. nelson Cross

23rd Pennsylvania

Col. Thomas H. Neill

31st Pennsylvania

Col. David H. Williams

61st Pennsylvania

Col. Oliver H. Rippey

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2nd Brigade

Brig. Gen. John J. Peck

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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 A.. Rowley

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3rd Brigade

Brig. Gen. Charles Devens, Jr.

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7th Massachusetts

Col. David A. Russell

10th Massachusetts

Col. Henry S. Briggs

2nd Rhode Island

Col. Frank Wheaton

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Artillery

Maj. Robert M. West

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Battery C, 1st Pennsylvania

Capt. Edward H. Flood

Battery E, 1st Pennsylvania

Capt. Theodore Miller

Battery H, 1st Pennsylvania

Capt. James Brady

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2nd Division

Brig. Gen. William F. Smith

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1st Brigade

Brig. Gen. Winfield S. Hancock

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7th Maine

Col. Hiram Burnham

43rd New York

Col. Francis L. Vinton

49th Pennsylvania

Col. William H. Irwin

5th Wisconsin

Col. Amasa Cobb

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2nd Brigade

Brig. Gen. W. T. H. Brooks

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2nd Vermont

Col. Henry Whiting

3rd Vermont

Col. Breed N.Hyde

4th Vermont

Col. Edwin H. Stoughton

5th Vermont

Lieut. Col. Lewis A. Grant

6th Vermont

Col. Nathan Lord

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3rd Brigade

(Temporarily under Hancock's command)

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7th Maine

Col. Edwin C. Mason

33rd New York

Col. Robert F. Taylor

49th New York

Col. Daniel D. Bidwell

76th New York

Col. James B. McKean

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Artillery

Capt. Romeyn B. Ayres

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1st New York

Lieut. Andrew Cowan

3rd New York

Capt. Thaddeus P. Mott

Battery E, 1st New York

Capt. Charles C. Wheeler

Battery F, 5th U.S.

Capt. Romeyn B. Ayres

3rd Division

Brig. Gen. Silas Casey

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1st Brigade

Brig. Gen. Henry M. Naglee

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11th Maine

Col. John C. Caldwell

56th New York

Col. Charles H. Van Wyck

100th New York

Col. James M. Brown

52nd Pennsylvania

Col. John C. Dodge, Jr.

104th Pennsylvania

Col. W. W. H. Davis

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2nd Brigade

Brig. Gen. William H. Keim

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96th New York

Lieut. Col. Charles O. Gray

85th Pennsylvania

Col. Joshua B. Howell

101st Pennsylvania

Col. Joseph H. Wilsonj

103rd Maj. Audley W. Gazzam

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3rd Brigade

Brig. Gen. Innis N. Palmer

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81st New York

Lieut. Col. Jacob J. De Forest

85th new York

Col. Jonathan S. Belknap

92nd New York

Lieut. Col. Benjamin C. Burler

98th New York

Col. William Dutton

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Arillery

Col. Guilford D. Bailey

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7th New York

Capt. Peter C. Regan

8th New York

Capt. Butler Fitch

Battery A, 1st New York

Capt. Thomas H. Bates

Battery H, 1st New York

Capt. Joseph Spratt

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Cavalry

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8th Illinois

Col. John F. Farnsworth

McClellan (Illinois) Dragoons

Maj. Charles W. Barker

3rd Pennsylvania

Col. William M. Averell

1st U. S.

Lieut. Col. William N. Grier

6th U. S.

Maj. Lawrence Williams

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Artillery

Lieut.Col. William Hays

Battery B & L, 2nd U.S.

Capt. James M. Robertson

Battery M, 2nd U.S.

Capt. Henry Benson

Battery C, 3rd U.S.

Capt. Horatio G. Gibson

Battery K, 3rd U.S.

Capt. John C. Tidball

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