Battle of South Mountain
Union Order of Battle
Army of the Potomac
Maj. Gen. George B. McClellan
Left Wing
Maj. Gen. Ambrose Burnside
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1 Corps (Turner's Gap)
Maj. Gen. Joseph Hooker
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1st Division
Brig. Gen. John Hatch (w)
Brig. Gen. Rufus King
Brig. Gen. Abner Doubleday
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1st Brigade
Col. Walter Phelps, Jr
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2nd U.S. Sharpshooters
Col. Henry A. V. Post
22nd New York Infantry
Lieut. Col. John McKie
24th New York Infantry
Capt. John D. O'Brian
30th New York Infantry
Col. William M. Searing
84th New York/14th Brooklyn Infantry
Maj. William H. DeBevoise
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2nd Brigade
​Brig. Gen. Abner Doubleday
Col. William Pratt (w)
Lieut. Col. John W. Hofmann
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7th Indiana Infantry
Maj. Ira G. Grover
56th Pennsylvania Infantry
Lieut. Col. John W. Hofmann
Capt. Frederick Williams
76th New York Infantry
Col. William P. Wainwright (w)
Lieut. Col. Chauncey Crandall
95th New York Infantry
Maj. Edward Pye
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3rd Brigade
Brig. Gen. Marsena Patrick
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21st New York Infantry
Col. William F. Rodgers
23rd New York Infantry
Col. Henry C. Hoffman
35th New York Infantry
Lieut. Col. Bradley Winslow
80th New York Infantry
Lieut. Col. Theodore B. Gates
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4th Brigade
Brig. Gen. John Gibbon
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2nd Wisconsin Infantry
Col. Lucius Fairchild
6th Wisconsin Infantry
Lieut. Col. Edward S. Bragg
7th Wisconsin Infantry
Capt. John Callis
19th Indiana Infantry
Col. Solomon Meredith
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1st Division Artillery
Capt. J. Albert Monroe
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New Hampshire Light, 1st Battery
Lieut. Frederick Edgall
1st New York Light, Battery L
Capt. John A. Reynolds
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2nd Division
Brig. Gen. James Ricketts
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1st Brigade
Brig. Gen. Abram Duryea
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97th New York Infantry
Maj. Charles Northrup
104th New York Infantry
Maj. Lewis C. Skinner
105th New York Infantry
Col. James M. Fuller
107th Pennsylvania Infantry
Capt. James MacThomson
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2nd Brigade
Col. William Henry Christian
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26th New York Infantry
Col. Richard H. Richardson
94th New York Infantry
Lieut. Col. Calvin Littlefield
88th Pennsylvania Infantry
Lieut. Col. George W. Gile
90th Pennsylvania Infantry
Col. Peter Lyle
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3rd Brigade
Brig. Gen. George L. Hartsuff
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12th Massachusetts Infantry
Maj. Elisha Burbank
13th Massachusetts Infantry
Maj. J. Parker Gould
83rd New York Infantry
Col. John W. Stiles
11th Pennsylvania Infantry
Col. Richard Coulter
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2nd Division Artillery
​
1st Pennsylvania Light, Battery F
Capt. Ezra W. Matthews
Pennsylvania Light, Battery C
Capt. James Thompson
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​3rd Division
Brig. Gen. George G. Meade
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1st Brigade
Brig. Gen. Truman Seymour
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1st Pennsylvania Reserves (30th P.V.I.)
Col. R. Biddle Roberts
2nd Pennsylvania Reserves (31st P.V.I.)
Maj. Horace Neide
5th Pennsylvania Reserves (34th P.V.I.)
Col. Joseph E. Fisher
6th Pennsylvania Reserve (35th P.V.I.)
Col. William Sinclair
13th Pennsylvania Reserve (42nd P.V.I.)
Col. Hugh W. McNeil
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2nd Brigade
Col. Albert Magilton
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3rd Pennsylvania Reserve
Lieut. Col. John C. Clark
4tth Pennsylvania Reserve
Maj. John Nyce
7th Pennsylvania Reserve
Col. Henry C. Bollinger
8th Pennsylvania Reserve
Capt. C. L. Connor
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3rd Brigade
Col. Thomas F. Gallagher (w)
Lieut. Col. Robert Anderson
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9th Pennsylvania Reserves
Lieut. Col. Robert Anderson
10th Pennsylvania Reserves
Lieut. Col. Adoniram J. Warner
11th Pennsylvania Reserves
Col. Thomas Gallagher (w)
Lieut. Col. Samuel M. Jackson
12th Pennsylvania Reserves
Capt. Richard Gustin
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​​3rd Division Artillery
​
1st Pennsylvania Light, Battery A
Lieut. John G. Simpson
1st Pennsylvania Light, Battery B
Capt. James H. Cooper
5th U.S. Battery C
Capt. Dunbar R. Ransom
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IX Corps (Fox's Gap)
Maj. Gen. Jesse L. Reno (k)
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Kanawha Division
Maj. Gen. Jacob Cox
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1st Brigade
Col. Eliakim Scammon
Col. Hugh B. Ewing
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12th Ohio Infantry
Col. Carr B. White
23rd Ohio Infantry
Lieut. Col. Rutherford B. Hayes (w)
30th Ohio Infantry
Lieut. Col. Theodore Jones
Ohio Light Artillery, 1st Battery
Capt. James R. McMullin
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2nd Brigade
Col. George Crook
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11th Ohio Infantry
Lieut. Col. Augustus H. Coleman
28th Ohio Infantry
Lieut. Col. Gottfried Becker
36th Ohio Infantry
Lieut. Col. Melvin Clarke
Kentucky Light Artillery, Simmond's Battery
Capt. Seth J. Simmonds
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1st Division
Brig. Gen. Orlando B. Willcox
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1st Brigade
Col. Benjamin Christ
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17th Michigan Infantry
Col. William H. Withington
50th Pennsylvania Infantry
Maj. Edward Overton, Jr.
79th New York Infantry
Lieut. Col. David Morrison
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2nd Brigade
Col. Thomas Welch
Col. William Fenton
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8th Michigan Infantry
Lieut. Col. Frank Graves
45th Pennsylvania Infantry
Lieut. Col. John I. Curtin
46th New York Infantry
Lieut. Col. Joseph Gerhardt
100th Pennsylvania Infantry
Lieut. Col. David A. Leckey
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1st Division Artillery
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Massachusetts Light Battery, 8th Battery
Capt. Asa Cook
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2nd Division
Brig. Gen. Samuel D. Sturgis
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1st Brigade
Brig. Gen. James Nagle
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2nd Maryland Infantry
Lieut. Col. J. Eugene Duryea
48th Pennsylvania Infantry
Lieut. Col. Joshua K. Sigfried
6th New Hampshire Infantry
Col. Simon G. Griffin
9th New Hampshire Infantry
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2nd Brigade
Brig. Gen. Edward Ferrero
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21st Massachusetts Infantry
Col. William S. Clark
35th Massachusetts Infantry
Col. Edward A. Wild
51st New York Infantry
Col. Robert Potter
51st Pennsylvania Infantry
Col. John F. Hartranft
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2nd Division Artillery
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​
Pennsylvania Light Artillery, Battery D
Capt. George Durell
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3rd Division
Brig. Gen. Isaac Rodman
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1st Brigade
Col. Harrison Fairchild
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9th New York Infantry
Lieut. Col. Edgar Kimball
89th New York Infantry
Maj. Edward Jardine
103rd New York Infantry
Maj. Benjamin Ringold
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2nd Brigade
Col. Edward Harland
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4th Rhode Island Infantry
Col. William H. P. Steere
11th Connecticut Infantry
Col. Henry Kingsbury
16th Connecticut Infantry
Col. Francis Beach
​
​
XI Corps (Crampton's Gap)
Maj. Gen. William B. Franklin
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1st Division
Maj. Gen. Henry Slocum
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1st Brigade
Col. Alfred Torbert
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1st New Jersey Infantry
Lieut. Col. Mark W. Collet
2nd New Jersey Infantry
Col. Samuel Buck
3rd New Jersey Infantry
Col. Henry Brown
4th New Jersey Infantry
Col. William B. Hatch
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2nd Brigade
Col. Joseph J. Bartlett
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5th Maine Infantry
Col. Nathaniel J. Jackson
16th New York Infantry
Lieut. Col. Joel Seaver
27th New York Infantry
Lieut. Col. Alexander D. Adams
121st New York Infantry
Col. Richard H. Franchot
96th Pennsylvania Infantry
Lieut. Col. Peter A. Filbert
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3rd Brigade
Brig. Gen. John Newton
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18th New York Infantry
Lieut. Col. George R. Myers
31st New York Infantry
Lieut. Col. Francis E. Pinto
32nd New York Infantry
Col. Roderick N. Matheson (m,w)
Lieut. Col. Francis E. Pinto
95th Pennsylvania Infantry
Col. Gustavus W. Town
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1st Division Artillery
Capt. Emory Upton
​
Battery A, Maryland Light Artillery
Capt. John W. Wolcott
1st Battery (A), Massachusetts Light Artillery
Capt. John Josiah Porter
1st Battery (A), New Jersey Light Artillery
Capt. William Hexamer
Battery D, 2nd U.S. Artillery
Lieut. Edward B. Williston
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2nd Division
Maj. Gen. William F. Smith
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1st Brigade
Brig. Gen. Winfield S. Hancock
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5th Wisconsin Infantry
Col. Amasa Cobb
6th Maine Infantry
Col. Hiram Burnham
43rd New York Infantry
Maj. John Wilson
137th Pennsylvania Infantry
Col. Henry M. Bossert
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2nd Brigade
Brig. Gen. William T. H. Brooks
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2nd Vermont Infantry
Maj. James H. Walbridge
4th Vermont Infantry
Lieut. Col. Charles Stoughton
5th Vermont Infantry
Lieut. Col. Lewis A. Grant
6th Vermont Infantry
Maj. Oscar Tuttle
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3rd Brigade
Col. William Howard Irwin
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7th Maine Infantry
Maj. Thomas Hyde
20th New York Infantry
Col. Ernest Von Vegesack
33rd New York Infantry
Lieut. Col. Joseph W. Corning
49th New York Infantry
Lieut. Col. William C. Alberger
77th New York Infantry
Capt. Nathan S. Babcock
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2nd Division Artillery
Capt. Romeyn M. Ayres
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Battery B, Maryland Light Artillery
Lieut. Theodore J. Vanneman
1st Independent Battery, New York Light Artillery
Capt. Andrew Cowan
Battery F, 5th U.S. Artillery
Lieut. Leonard Martin