Union command at the Battle oF Gettysburg,Pennsylvania
                       UNION COMMAND AT THE BATTLE OF 
                              JULY 1-3, 1863

                            ARMY OF THE POTOMAC
ARMY HEADQUARTERS Major General Daniel Butterfield,Chief of Staff Brigadier General G.K. Warren, Chief of Engineers Brigadier General Henry Hunt, Chief of Artillery Brigadier General Marsena Patrick, Provost Marshall Brigadier Seth Williams, Assistant Adjuntant General Brigadier General Rufus Ingalls, Chief Quartermaster Dr. Jonathan Letterman, Medical Director Captain Lemuel Norton, Chief Signal Officer Lieutenant John Edie, Acting Chief Ordnance Officer COMMAND OF THE PROVOST MARSHALL 2nd. Pennsylvania Cavalry 6th. Pennsylvania Cavalry,Companies E and I Regular Cavalry detatchments from 1st.,2nd.,5th.,and 6th. Regiments
I FIRST ARMY CORP I Major General John F. Reynolds Major General Abner Doubleday Major General John Newton GENERAL HEADQUARTERS 1st. Maine Cavalry, Company L FIRST DIVISION Bridadier General James S. Wadsworth FIRST BRIGADE SECOND BRIGADE Brig.Gen. Solomon Meredith Brig.Gen. Lysander Cutler 19th. Indiana 7th. Indiana 24th. Michigan 76th. New York 2nd. Wisconsin 84th. New York 6th. Wisconsin 95th. New York 7th. Wisconsin 147th. New York 56th. Pennsylvania SECOND DIVISION Brigadier General John C. Robinson FIRST BRIGADE SECOND BRIGADE Brig.Gen. Gabriel R. Paul Brig.Gen. Henry Baxter Colonel Samuel H. Leonard Colonel Adrian R. Root Colonel Richard Coulter 16th. Maine 12th. Massachusetts 13th. Massachusetts 83rd. New York 94th. New York 97th. New York 104th. New York 11th. Pennsylvania 107th. Pennsylvania 88th. Pennsylvania 90th. Pennsylvania THIRD DIVISION Brig.Gen. Thomas A. Rowley Maj.Gen. Abner Doubleday FIRST BRIGADE SECOND BRIGADE Colonel Chapman Biddle Colonel Roy Stone Brig.Gen. Thomas A. Rowley Colonel Langhorne Wister Colonel Chapman Biddle Colonel Edmund L. Dana 80th. New York 143rd. Pennsylvania 121st. Pennsylvania 149th. Pennsylvania 142nd. Pennsylvania 150th. Pennsylvania 151st. Pennsylvania THIRD BRIGADE Brig.Gen. George G. Stannard Colonel Francis Randall 13th. Vermont 14th. Vermont 16th. Vermont ARTILLERY BRIGADE Colonel Charles S. Wainwright Maine Light,Battery B Maine Light,Battery E 1st. New York,Batteries L & E 1st. Pennsylvania Light,Battery B 4th. United States,Battery B
II SECOND ARMY CORP II Major General Winfield S. Hancock Brigadier General John Gibbon Major General Winfield S. Hancock GENERAL HEADQUARTERS 6th. New York Cavalry,Companies D & K FIRST DIVISION Brigadier General John C. Caldwell FIRST BRIGADE SECOND BRIGADE Colonel Edward E. Cross Colonel Patrick Kelly Colonel H. Boyd McKern 5th. New Hampshire 28th. Massachusetts 61st. New York 63rd. New York 81st. Pennsylvania 69th. New York 148th. Pennsylvania 88th. New York 116th. Pennsylvania THIRD BRIGADE FOURTH BRIGADE Brig.Gen. Samuel K. Zook Colonel John R. Brooke Colonel H. Boyd McKeen 52nd. New York 27th. Connecticut 57th. New York 2nd. Delware 66th. New York 64th. New York 140th. Pennsylvania 53rd. Pennsylvania 145th. Pennsylvania SECOND DIVISION Brig.Gen John Gibbon Brig.Gen. William Harrow Brig.Gen. John Gibbon FIRST BRIGADE SECOND BRIGADE Brig.Gen. William Harrow Brig.Gen. Alexander Webb Colonel Francis Heath 19th. Maine 69th. Pennsylvania 15th. Massachusetts 71st. Pennsylvania 1st. Minnesota 72nd. Pennsylvania 82nd. New York 106th. Pennsylvania (unattached) Massachusetts Sharpshooters 1st. Company THIRD BRIGADE Colonel Norman Hall 19th. Massachusetts 20th. Massachusetts 7th. Michigan 42nd. New York 59th. New York THIRD DIVISION Brigadier General Alexander Hays FIRST BRIGADE SECOND BRIGADE Colonel Samuel S. Carrol Colonel Thomas A. Smyth Lt.Colonel Francis Pierce 14th. Indiana 14th. Connecticut 4th. Ohio 1st. Delaware 8th. Ohio 12th. New Jersey 7th. W. Virginia 10th. New York 108th. New York THIRD BRIGADE Colonel George L. Willard Colonel Eliakim Sherril Lt.Colonel James M. Bull 39th. New York 111th. New York 125th. New York 126th. New York ARTILLERY BRIGADE Captain John G. Hazard 1st. New York Light,Battery B and 14th. New York Battery 1st. Rhode Island Light,Battery A 1st. Rhode Island Light,Battery B 1st. United States,Battery I 4th. United States,Battery A
III THIRD ARMY CORP III Major General Daniel E. Sickles Major General David B. Birney FIRST DIVISION Major General David B. Birney Brigadier General Hobart Ward FIRST BRIGADE SECOND BRIGADE Brig.Gen. Charles k. Graham Brig.Gen. Hobart Ward Colonel Andew H. Tippon Colonel Hiram Berdan 57th. Pennsylvania 20th. Indiana 63rd. Pennsylvania 3rd. Maine 68th. Pennsylvania 4th. Maine 105th. Pennsylvania 86th. New York 114th. Pennsylvania 124th. New York 141st. Pennsylvania 99th. Pennsylvania 1st. United States Sharpshooters 2nd. United States Sharpshooters THIRD BRIGADE Colonel P. Regis De Trobriand 17th. Maine 3rd. Michigan 5th. Michigan 40th. New York 110th. Pennsylvania SECOND DIVISION Brigadier General Andrew A. Humphreys FIRST BRIGADE SECOND BRIGADE Brig.Gen. Joseph P. Carr Colonel William R. Brewster 1st. Massachusettes 70th. New York 11th. Massachusetts 71st. New York 16th. Massachusetts 72nd. New York 12th. New Hampshire 73rd. New York 11th. New Jersey 74th. New York 26th. Pennsylvania 120th. New York THIRD BRIGADE Colonel George C. Burling 2nd. New Hampshire 5th. New Jersey 6th. New Jersey 7th. New Jersey 8th. New Jersey 115th. Pennsylvania ARTILLERY BRIGADE Captain George C. Randolph Captain A. Judson Clark New Jersey Light,2nd.Battery 1st. New York Light,Battery D New York Light,4th. Battery 1st. Rhode Island Light,Battery E 4th. United States,Battery K
V FIFTH ARMY CORP V Major General George Sykes GENERAL HEADQUARTERS 12th. New York Infantry, Companies D & E 17th. Pennsylvania Cavalry, Companies D & E FIRST DIVISION Brigadier General James Barnes FIRST BRIGADE SECOND BRIGADE Colonel William S. Tilton Colonel Jacob B. Sweitzer 18th. Massachusetts 9th. Massachusetts 22nd. Massachusetts 32nd. Massachusetts 1st. Michigan 4th. Michigan 118th. Pennsylvania 62nd. Pennsylvania THIRD BRIGADE Colonel Strong Vincent Colonel James C. Rice 20th. Maine 16th. Michigan 44th. New York 83rd. Pennsylvania SECOND DIVISION Brigadier General Romeyn B. Ayers FIRST BRIGADE SECOND BRIGADE Colonel Hannibal Day Colonel Sidney Burbank 3rd. United States 2nd. United States 4th. United States 7th. United States 6th. United States 10th. United States 12th. United States 11th. United States 14th. United States 17th. United States THIRD BRIGADE Brig.Gen. Steven H. Weed Colonel Kenner Garrard 140th. New York 146th. New York 91st. Pennsylvania 155th. Pennsylvania THIRD DIVISION Brigadier General Samuel W. Crawford FIRST BRIGADE SECOND BRIGADE Colonel William McCandles Colonel Joseph W. Fisher 1st. Pennsylvania Reserves 5th. Pennsylvania Reserves 2nd. Pennsylvania Reserves 9th. Pennsylvania Reserves 6th. Pennsylvania Reserves 10th. Pennsylvania Reserves 13th. Pennsylvania Reserves 11th. Pennsylvania Reserves 12th. Pennsylvania Reserves ARTILLERY BRIGADE Captain Augustus P. Martin Massachusetts Light,Battery C 1st. New York, Battery C 1st. Ohio Light,Battery L 5th. United States,Battery D 5th. United States,Battery I
VI SIXTH ARMY CORP VI Major General John Sedgwick GENERAL HEADQUARTERS 1st. New York Cavalry,Company L 1st. Pennsylvania Cavalry,Company H PROVOST GUARD 4th. New Jersey FIRST DIVISION Brigadier General Horatio C. Wright FIRST BRIGADE SECOND BRIGADE Brig.Gen. A.T.A. Torbert Brig.Gen. Joseph L.J. Barlett 1st. New Jersey 5th. Maine 2nd. New Jersey 121st. New York 3rd. New Jersey 95th. Pennsylvania 15th. New Jersey 96th. Pennsylvania THIRD BRIGADE Brig.Gen. David K. Russell 6th. Maine 49th. Pennsylvania 119th. Pennsylvania 5th. Wisconsin SECOND DIVISION Brigadier General Albion P. Howe SECOND BRIGADE THIRD BRIGADE Colonel Lewis A. Grant Brig.Gen. Thomas H. Neill 2nd. Vermont 7th. Maine 3rd. Vermont 33rd. New York 4th. Vermont 43rd. New York 5th. Vermont 49th. New York 6th. Vermont 77th. New York 61st. Pennsylvania THIRD DIVISION Major General John Newton Brigadier General Frank Wheaton FIRST BRIGADE SECOND BRIGADE Brig.Gen Alexander Shaler Colonel Henry L. Eustis 65th. New York 7th. Massachusetts 67th. New York 10th. Massachusetts 122nd. New York 37th. Massachusetts 23rd. Pennsylvania 2nd. Rhode Island 82nd. Pennsylvania THIRD BRIGADE Brig.Gen. Frank Wheaton Colonel Frank J. Nevin 62nd. New York 93rd. Pennsylvania 98th. Pennsylvania 139th. Pennsylvania ARTILLERY BRIGADE Colonel Charles H. Tompkins Massachusetts Light,Battery A New York Light,Battery A New York Light,Battery C 1st. Rhode Island Light,Battery C 1st. Rhode Island Light,Battery G 2nd. United States,Battery D 2nd. United States,Battery G 5th. United States,Battery F
XI ELEVENTH ARMY CORP XI Major General Oliver O. Howard Major General Carl Schultz Major General Oliver O. Howard GENERAL HEADQUARTERS 1st. Indiana Cavalry,Companies I & K 8th. New York Infantry FIRST DIVISION Brigadier General Francis C. Barlow Brigadier General Albert Ames FIRST BRIGADE SECOND BRIGADE Colonel Leopold Von Gilsa Brig.Gen. Albert Ames Colonel Andrew L. Harris 41st. New York 17th. Connecticut 54th. New York 25th. Ohio 68th. New York 75th. Ohio 153rd. Pennsylvania 107th. Ohio SECOND DIVISION Brigadier General Adolph Von Steinwehr FIRST BRIGADE SECOND BRIGADE Colonel Charles R. Coster Colonel Orland Smith 134th. New York 33rd. Massachusetts 154th. New York 136th. New York 27th. Pennsylvania 55th. Ohio 73rd. Pennsylvania 73rd. Ohio THIRD DIVISION Major General Carl Schurz Brigadier General Alexander Schimmelfenning Major General Carl Schurz FIRST BRIGADE SECOND BRIGADE Brig. Gen. Alexander Schimmelfenning Colonel W. Krzyzanowski Colonel George Von Amsberg 82nd. Illinois 58th. New York 45th. New York 119th. New York 157th. New York 82nd. Ohio 61st. Ohio 75th. Pennsylvania 74th. Pennsylvania 26th. Wisconsin ARTILLERY BRIGADE Major Thomas W. Osborn 1st. New York Light,Battery I New York Light, 13th. Battery 1st. Ohio Light,Battery I 1st. Ohio Light,Battery K 4th. United States,Battery G
XII TWELFTH ARMY CORP XII Major General Henry W. Slocum Brigadier General Alpheus Williams PROVOST GUARD 10th. Maine Infantry FIRST DIVISION Brigadier General Alpheus Williams Brigadier General Thomas H. Ruger FIRST BRIGADE SECOND BRIGADE Colonel Archibald McDougall Brig.Gen. Henry Lockwood 5th. Connecticut 1st. Maryland, Potomac 20th. Connecticut Home Brigade 3rd. Maryland 1st. Maryland, Eastern Shore 123rd. New York 150th. New York 145th. New York 46th. Pennsylvania THIRD BRIGADE Brig.Gen. Thomas H. Ruger Colonel Silas Colgrove 27th. Indiana 2nd. Massachusetts 13th. New York 107th. New York 3rd. Wiscosin SECOND DIVISION Brigadier General John W. Geary FIRST BRIGADE SECOND BRIGADE Colonel Charles Candy Colonel George A. Corham Brig.Gen. Thomas L. Kane Colonel George A. Corham 5th. Ohio 29th. Pennsylvania 7th. Ohio 109th. Pennsylvania 29th. Ohio 111th. Pennsylvania 66th. 0hio 147th. Pennsylvania 28th. Pennsylvania THIRD BRIGADE Brig.Gen. George S. Greene 60th. New York 78th. New York 102nd. New York 137th. New York 149th. New York ARTILLERY BRIGADE Lieutenant Edward D. Muhlenberg 1st. New York Light,Battery M Pennsylvania Battery E 4th. United States,Battery F 5th. United States,Battery K
CAVALRY CORP Major General Alfred Pleasanton FIRST DIVISION Brigadier General John Buford FIRST BRIGADE SECOND BRIGADE Colonel William Gamble Colonel Thomas Devin 8th. Illinois 6th. New York 12th. Illinois 9th. New York 3rd. Indiana 17th. Pennsylvania 8th. New York 3rd. West Virginia RESERVE BRIGADE Brig.Gen. William Merritt 6th. Pennsylvania 1st. United States 2nd. United States 5th. United States 6th. United States SECOND DIVISION Brigadier General David Gregg HEADQUARTERS GUARD 1st. Ohio, Company A FIRST BRIGADE THIRD BRIGADE Colonel John B. McIntosh Colonel J. Irvin Gregg 1st. Maryland 1st. Maine Legion,Company A 10th. New York 1st. Massachusetts 4th. Pennsylvania 1st. New Jersey 16th. Pennsylvania 1st. Pennsylvania 3rd. Pennsylvania 3rd. Pennsylvania Artillery,Battery H THIRD DIVISION Brigadier General Judson Kilpatrick HEADQUARTERS GUARD 1st Ohio, Company C FIRST BRIGADE SECOND BRIGADE Brig.Gen. Elon Farnsworth Brig.Gen. George A. Custer Colonel Nathan Richmond 5th. New York 1st. Michigan 18th. Pennsylvania 5th. Michigan 1st. Vermont 6th. Michigan 1st. W. Virginia 7th. Michigan HORSE ARTILLERY FIRST BRIGADE SECOND BRIGADE Capt. James Robertson Capt. John Tidball 9th. Michigan 1st. United States 6th. New York Batteries E & G 2nd. United States 1st United States Batteries B & L Battery K 4th. United States 2nd. United States Battery E and A ARTILLERY RESERVE Brigadier General Robert O. Tyler Captain James Robertson HEADQUARTERS GUARD 32nd. Massachusetts, Company C FIRST BRIGADE FIRST BRIGADE (Regulars) (Reserve) Capt. Dunbar R. Ransom Lt.Col. Freeman McGillvery 1st. United States, Massachusetts Light, Battery H 5th. Battery 3rd. United States, 10th. New York Batteries F & K Massachusetts Light, 4th. United States, 9th. Battery Battery C New York Light, 5th. United States, 15th. Battery Battery C Pennsylvania, Batteries C & F SECOND BRIGADE THIRD BRIGADE (Volunteers) (Volunteers) Capt. Elijah D. Tate Capt. James Huntington Connecticut Light, New Hampshire Light, 2nd. Battery 1st. Battery New York Light, 1st. Ohio 5th. Battery Battery H 1st. Pennsylvania Light, Batteries F & G West Virginia Light, Battery C THIRD BRIGADE (Volunteers) Capt. Robert H. Fitzhugh Maine Light, Battery F Maryland Light, Battery A New Jersey Light, 1st. Battery 1st. New York Light, Battery G & K 11th. New York TRAIN GUARD 4th. New Jersey Infantry
On Wednes, July 1st, The Army of the Potomac fielded approx. 20,000 troops. On Thurs, July 2nd, The Army of the Potomac fielded approx. 53,000 troops. On Fri, July 3rd, The Army of the Potomac fielded approx. 93,000 troops.

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