# Peninsula campaign order of battle: Union

The following Union Army units and commanders were the initial structure on April 4, 1862 of the Union Department of the Potomac during the Peninsula campaign of the American Civil War. This list includes units deployed to the Virginia Peninsula, and those that remained in the Washington area. The Confederate order of battle is listed separately.

## Abbreviations used
### Military rank

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

## Army of the Potomac

The following units were the initial organization of the Army of the Potomac on the peninsula.
MG George B. McClellan, Commanding
Headquarters and Body Guard
* Co. A, 4th U.S. Cavalry: Lt James B. McIntire
* Co. E, 4th U.S. Cavalry: Lt William O'Connell
* Oneida Independent Cavalry Company: Cpt Daniel P. Mann
* Sturges' Rifles: Cpt James Steele
Provost Guard
* 2nd U.S. Cavalry: Maj Alfred Pleasonton
* Battalion of 8th U.S. Infantry (Cos. F & G) and 17th U.S. Infantry (Cos. B & D): Maj George L. Willard

### Staff

Col Randolph B. Marcy, Chief of Staff
Maj Granville O. Haller, Commandant of General Headquarters
| Function | Individuals |
| Adjutant   BG Seth Williams | Ltc James A. Hardie (aide-de-camp) Cpt Richard B. Irwin |
| Inspector General   Col Delos B. Sackett | Maj Nelson H. Davis |
| Engineers   BG John G. Barnard | Ltc Barton S. Alexander Cpt Charles S. Stewart Lt Cyrus B. Comstock Lt Miles D. McAlester Lt William E. Merrill Lt Francis U. Farquhar |
| Topographical Engineers   BG Andrew A. Humphreys | Lt Henry L. Abbot Lt Orlando G. Wagner Lt Nicholas Bowen Lt John Moulder Wilson Lt James H. Wilson |
| Medical Corps   Charles S. Tripler | Surgeons and Nurses |
| Quartermaster   Maj Stewart Van Vliet | Ltc Rufus Ingalls Ltc Charles G. Sawtelle |
| Commissary   Col Henry F. Clarke | Col Amos Beckwith Ltc George Bell Ltc A. Parker Porter Cpt Thomas Wilson Cpt Brownell Granger Cpt William H. Bell Cpt John H. Woodward Cpt W.R. Murphy |
| Ordnance   Cpt Charles P. Kingsbury | Lt Thomas G. Baylor Other unnamed officers |
| Provost-Marshal   BG Andrew Porter | Maj William H. Wood Cpt James W. McMillan Cpt William T. Gentry Cpt James W. Forsyth Lt John W. Jones Lt Charles F. Trowbridge Lt Calvin D. Mehaffey |
| Judge Advocate   Col Thomas T. Gantt | Unnamed officers |
| Signal Corps   Maj Albert J. Myer | Unnamed officers |
| Telegraphic Office   Maj Thomas Eckert | Mr. A. Harper Caldwell |
| Balloon Corps   Professor Thaddeus S.C. Lowe | Lowe's Aeronauts |
| Personal Staff | Col Thomas M. Key Col Edward H. Wright Col John J. Astor, Jr. Ltc Albert V. Colburn Ltc Nelson B. Sweitzer Ltc Edward McK. Hudson Ltc Paul Von Radowitz Maj Herbert Von Hammerstein Maj William W. Russell (USMC) Maj Ferdinand Lecompte (Swiss Army Engineer) Cpt George A. Custer Cpt Joseph Kirkland Cpt Arthur McClellan Cpt Louis Philippe d'Orleans Cpt Robert d'Orleans Cpt Martin T. McMahon Cpt William P. Mason, Jr. Cpt William F. Biddle Cpt Edward A. Raymond |

### II Corps

BG Edwin Sumner, Commanding  Ltc Joseph H. Taylor, Adjutant
| Division | Brigade | Regiments and others |
| First Division   BG Israel B. Richardson | First Brigade   BG Oliver O. Howard | 5th New Hampshire: Col Edward E. Cross 81st Pennsylvania: Col James Miller 61st New York: Col Francis C. Barlow 64th New York: Col Thomas J. Parker |
| First Division   BG Israel B. Richardson | Second Brigade   BG Thomas Francis Meagher | 69th New York: Col Robert Nugent 63rd New York: Ltc John Burke 88th New York: Col Henry M. Baker |
| First Division   BG Israel B. Richardson | Third Brigade   BG William H. French | 52nd New York: Col Paul Frank 57th New York: Col Samuel K. Zook 66th New York: Col Joseph C. Pinckney 53rd Pennsylvania: Col John R. Brooke |
| First Division   BG Israel B. Richardson | Artillery | Batteries A & C, 4th U.S. Artillery: Cpt Francis N. Clarke Six Napoleons Battery G, 1st New York Artillery: Cpt John D. Frank Six 10-lb Parrotts Battery B, 1st New York Artillery: Cpt Rufus D. Pettit Six 10-lb Parrotts Battery A, 2nd New York Artillery: Cpt William H. Hogan Six 10-lb Parrotts |
| Second Division   BG John Sedgwick | First Brigade   BG Willis A. Gorman | 2nd New York State Militia: Col George W.B. Tompkins 15th Massachusetts: Col Charles Devens 1st Minnesota: Col Alfred Sully |
| Second Division   BG John Sedgwick | Second Brigade   BG William Wallace Burns | 69th Pennsylvania: Col Joshua T. Owen 71st Pennsylvania: Col Isaac J. Wistar 72nd Pennsylvania: Col DeWitt Clinton Baxter 106th Pennsylvania: Col Turner G. Morehead |
| Second Division   BG John Sedgwick | Third Brigade   BG Napoleon J.T. Dana | 19th Massachusetts: Col Edward W. Hinks 20th Massachusetts: Col William R. Lee 7th Michigan: Col Ira R. Grosvenor 42nd New York: Col Edmund C. Charles |
| Second Division   BG John Sedgwick | Artillery | Battery I, 1st U.S. Artillery: Lt Edmund Kirby Six Napoleons Battery A, 1st Rhode Island Artillery: Cpt John A. Tompkins Four 10-lb Parrotts, two 12-lb howitzers Battery B, 1st Rhode Island Artillery: Cpt Walter O. Bartlett Four 10-lb Parrotts, two 12-lb howitzers Battery G, 1st Rhode Island Artillery: Cpt Charles Owen Six 3-inch ordnance guns |
| Cavalry reserve | Unbrigaded | 8th Illinois Cavalry: Col John F. Farnsworth 6th New York Cavalry (Cos. D & K): Maj Floyd Clarkson |
N.B. The Third Division under BG Louis Blenker was detached in early April and transferred to the Mountain Department

### III Corps

BG Samuel P. Heintzelman, Commanding  Cpt Chauncey McKeever, Chief of Staff
| Division | Brigade | Regiments and others |
| First Division   BG Fitz John Porter | First Brigade   BG John H. Martindale | 2nd Maine: Col Charles W. Roberts 18th Massachusetts: Col James Barnes 22nd Massachusetts: Col Jesse Gove 25th New York: Col Charles Johnson 13th New York: Col Elisha Marshall |
| First Division   BG Fitz John Porter | Second Brigade   BG George W. Morell | 14th New York: Col James McQuade 4th Michigan: Col Dwight A. Woodbury 9th Massachusetts: Col Thomas Cass 62nd Pennsylvania: Ltc Jacob B. Sweitzer |
| First Division   BG Fitz John Porter | Third Brigade   BG Daniel Butterfield | 17th New York: Col Henry S. Lansing 44th New York: Col Stephen W. Stryker 12th New York: Col Henry A. Weeks 83rd Pennsylvania: Col John W. McLane 16th Michigan: Col Thomas B. Stockton 1st Berdan Sharpshooters: Col Hiram Berdan |
| First Division   BG Fitz John Porter | Artillery  Cpt Charles Griffin | Battery D, 5th U.S. Artillery: Cpt Charles Griffin Six 10-lb Parrotts Battery C, 1st Rhode Island Artillery: Cpt William B. Weeden Battery C, Massachusetts Artillery: Cpt Augustus C. Martin Six Napoleons Battery E, Massachusetts Artillery: Cpt George D. Allen Six 3-inch ordnance guns |
| Second Division   BG Joseph Hooker | First Brigade   BG Henry Morris Naglee | 1st Massachusetts: Col Robert Cowdin 11th Massachusetts: Col William E. Blaisdell 26th Pennsylvania: Col William F. Small 2nd New Hampshire: Col Gilman Marston |
| Second Division   BG Joseph Hooker | Second Brigade   BG Daniel Sickles | 70th New York: Col William Dwight 71st New York: Col George B. Hall 72nd New York: Col Nelson Taylor 73rd New York: Col William R. Brewster 74th New York: Col Charles K. Graham |
| Second Division   BG Joseph Hooker | Third Brigade ("2nd New Jersey Brigade")   Col Samuel H. Starr | 5th New Jersey: Col William Joyce Sewell 6th New Jersey: Col James T. Hatfield 7th New Jersey: Col Joseph W. Revere 8th New Jersey: Col Adolphus J. Johnson |
| Second Division   BG Joseph Hooker | Artillery  Cpt Norman J. Hall | Battery H, 1st U.S. Artillery: Cpt Norman J. Hall Four 10-lb Parrotts, two 12-lb howitzers 4th New York Independent Battery: Cpt James E. Smith Six 10-lb Parrotts 6th New York Independent Battery: Cpt William M. Bramhall Six 3-inch ordnance guns Battery D, 1st New York Artillery: Cpt Thomas W. Osborn Four 3-inch ordnance guns |
| Third Division   BG Charles Smith Hamilton | First Brigade   Col Charles D. Jameson | 105th Pennsylvania: Col Amor A. McKnight 63rd Pennsylvania: Col Alexander Hays 57th Pennsylvania: Col Charles T. Campbell 87th New York: Col Stephen Hodge |
| Third Division   BG Charles Smith Hamilton | Second Brigade   BG David B. Birney | 38th New York: Col J. H. Hobart Ward 40th New York: Col Edward J. Riley 3rd Maine: Col Moses B. Lakeman 4th Maine: Ltc Elijah Walker |
| Third Division   BG Charles Smith Hamilton | 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 John H. McCunn |
| Third Division   BG Charles Smith Hamilton | Artillery  Cpt James Thompson | Battery G, 2nd U.S. Artillery: Cpt James Thompson Six Napoleons Battery B, New Jersey Artillery: Cpt John E. Beam Four 10-lb Parrotts, two Napoleons Battery E, 1st Rhode Island Artillery: Cpt George E. Randolph Four 10-lb Parrotts, two Napoleons |
| Cavalry reserve | Unbrigaded | 3rd Pennsylvania Cavalry: Col William W. Averell |
Porter's Division was combined with Sykes' Division of the Reserve Corps and McCall's Division of the First Corps to form the Fifth Corps (Provisional) on May 18, 1862.

### IV Corps

BG Erasmus D. Keyes, Commanding  Ltc Charles C. Suydam
| Division | Brigade | Regiments and others |
| First Division   BG Darius N. Couch | First Brigade   Col Henry Shaw Briggs | 2nd Rhode Island: Col Horatio Rogers, Jr. 7th Massachusetts: Col David Allen Russell 10th Massachusetts: Col Henry Shaw Briggs 36th New York: Col Charles H. Innes |
| First Division   BG Darius N. Couch | Second Brigade   BG Lawrence P. Graham | 67th New York: Col Julius W. Adams 65th New York: Col John Cochrane 23rd Pennsylvania: Col Thomas H. Neill 31st Pennsylvania: Col David H. Williams 61st Pennsylvania: Col Oliver H. Rippey |
| First Division   BG Darius N. Couch | Third Brigade   BG John J. Peck | 98th Pennsylvania: Col John F. Ballier 102nd Pennsylvania: Col Thomas A. Rowley 93rd Pennsylvania: Col James M. McCarter 62nd New York: Col John L. Riker 55th New York: Col P. Regis de Trobriand |
| First Division   BG Darius N. Couch | Artillery | Battery C, 1st Pennsylvania Artillery: Cpt Jeremiah McCarthy Four 10-lb Parrotts Battery D, 1st Pennsylvania Artillery: Cpt Edward H. Flood Four 10-lb Parrotts Battery E, 1st Pennsylvania Artillery: Cpt Theodore Miller Four Napoleons Battery H, 1st Pennsylvania Artillery: Cpt James Brady Four 10-lb Parrotts |
| Second Division   BG W.F. "Baldy" Smith | First Brigade   BG Winfield Scott Hancock | 5th Wisconsin: Col Amasa Cobb 49th Pennsylvania: Col William H. Irwin 43rd New York: Col Francis L. Vinton 6th Maine: Col Hiram Burnham |
| Second Division   BG W.F. "Baldy" Smith | Second Brigade     BG William T.H. Brooks | 2nd Vermont: Col Henry H. Whiting 3rd Vermont: Ltc Breed N. Hyde 4th Vermont: Col Edwin H. Stoughton 5th Vermont: Col Henry A. Smalley 6th Vermont: Ltc Nathan S. Lord |
| Second Division   BG W.F. "Baldy" Smith | Third Brigade   BG John Davidson | 33rd New York: Col Robert F. Taylor 77th New York: Col James B. McKean 49th New York: Col Daniel D. Bidwell 7th Maine: Ltc Seldon Connor |
| Second Division   BG W.F. "Baldy" Smith | Artillery  Cpt Romeyn B. Ayres | Battery F, 5th U.S. Artillery: Cpt Romeyn B. Ayres Four 10-lb Parrotts, two Napoleons 3rd New York Independent Battery: Cpt Thaddeus P. Mott Four 10-lb Parrotts, two Napoleons Battery E, 1st New York Artillery: Cpt Charles C. Wheeler Four 3-inch ordnance guns 1st New York Independent Battery: Cpt Terance J. Kennedy Six 3-inch ordnance guns |
| Third Division   BG Silas Casey | First Brigade   Col William W.H. Davis | 104th Pennsylvania: Ltc John W. Neilds 52nd Pennsylvania: Col John C. Dodge 56th New York: Col Charles Van Wyck 100th New York: Col James M. Brown 11th Maine: Col John C. Caldwell |
| Third Division   BG Silas Casey | Second Brigade   BG William High Keim | 85th Pennsylvania: Col Joshua B. Howell 101st Pennsylvania: Col Joseph H. Williams 103rd Pennsylvania: Col Theodore F. Lehmann 96th New York: Col James Fairman |
| Third Division   BG Silas Casey | Third Brigade   BG Innis N. Palmer | 85th New York: Col Jonathan S. Belknap 98th New York: Col William Dutton 92nd New York: Col Jonah Sanford 81st New York: Col Edwin Rose 93rd New York: Col John S. Crocker |
| Third Division   BG Silas Casey | Artillery  Col Guilford D. Bailey | 7th New York Independent Battery: Cpt Peter C. Regan Six 3-inch ordnance guns 8th New York Independent Battery: Cpt Butler Fitch Six 3-inch ordnance guns Battery A, 1st New York Artillery: Cpt Thomas H. Bates Six Napoleons Battery H, 1st New York Artillery: Cpt Joseph Spratt Four 3-inch ordnance guns |
| Cavalry Reserve | Unbrigaded | 6th New York Cavalry (Cos. F & H): ? |
W.F. Smith's Division was combined with Franklin's Division of the First Corps to form the Sixth Corps (Provisional) on May 18, 1862.

### Reserves

| Division | Brigade | Regiments and others |
| Cavalry   BG Philip St. George Cooke | First Brigade   BG William H. Emory | 5th U.S. Cavalry: Cpt Charles J. Whiting 6th U.S. Cavalry: Maj Lawrence A. Williams 6th Pennsylvania Cavalry: Col Richard H. Rush |
| Cavalry   BG Philip St. George Cooke | Second Brigade   Col George A.H. Blake | 1st U.S. Cavalry: Ltc William N. Grier 8th Pennsylvania Cavalry: Col David McM. Gregg Barker's Squadron, Illinois Cavalry: Cpt Charles W. Barker |
| Artillery   Col Henry J. Hunt | Horse Artillery Brigade   Ltc William Hays | Battery A, 2nd U.S. Artillery: Cpt John C. Tidball Six 3-inch ordnance rifles Batteries B & L, 2nd U.S. Artillery: Cpt James M. Robertson Six 3-inch ordnance rifles Battery M, 2nd U.S. Artillery: Cpt Henry Benson Six 3-inch ordnance rifles Batteries C & G, 3rd U.S. Artillery: Cpt Horatio G. Gibson Six 3-inch ordnance rifles |
| Artillery   Col Henry J. Hunt | Second Brigade   Ltc George W. Getty | Battery K, 1st U.S. Artillery: Cpt William M. Graham Six Napoleons Batteries E & G, 1st U.S. Artillery: Lt Alanson M. Randol Six Napoleons Battery E, 2nd U.S. Artillery: Cpt J. Howard Carlisle Six 20-lb Parrotts Batteries L & M, 3rd U.S. Artillery: Cpt John Edwards, Jr. Six 10-lb Parrotts Batteries F & K, 3rd U.S. Artillery: Cpt La Rhett L. Livingston Four 10-lb Parrotts Battery G, 4th U.S. Artillery: Lt Charles H. Morgan Six Napoleons Battery K, 4th U.S. Artillery: Lt Francis W. Seeley Six Napoleons Battery I, 5th U.S. Artillery: Cpt Stephen H. Weed Six 3-inch ordnance guns Battery K, 5th U.S. Artillery: Cpt John R. Smead Four Napoleons Battery A, 5th U.S. Artillery: Cpt Adelbert Ames Four 10-lb Parrotts, two Napoleons |
| Artillery   Col Henry J. Hunt | Third Brigade   Maj Albert Arndt | Battery A, 1st New York Artillery Battalion: Cpt Otto Diedrich Six 20-lb Parrotts Battery B, 1st New York Artillery Battalion: Cpt Adolph Voegele Four 20-lb Parrotts Battery C, 1st New York Artillery Battalion: Cpt John Knieriem Four 20-lb Parrotts Battery D, 1st New York Artillery Battalion: Cpt Edward Grimm Six 32-lb howitzers |
| Engineers | Volunteers   BG Daniel Phineas Woodbury | 15th New York: Col J. McLeod Murphy 50th New York: Col Charles B. Stuart |
| Engineers | Regulars   Cpt James Chatham Duane | Co. A, U.S. Engineers: Lt Chauncey B. Reese Co. B, U.S. Engineers: Lt Charles E. Cross Co. C, U.S. Engineers: Lt Orville E. Babcock |
| Engineers | Artillery Siege Train | 1st Connecticut Heavy Artillery: Col Robert O. Tyler |
| Infantry | Regulars   BG George Sykes | 2nd U.S. Infantry (9 companies): Ltc William Chapman 3rd U.S. Infantry (7 companies): ? 4th U.S. Infantry (10 companies): Ltc Robert C. Buchanan 6th U.S. Infantry (10 companies): Cpt Levi C. Bootes 10th & 17th U.S. Infantry (8 companies): ? 11th U.S. Infantry (6 companies): Cpt DeLancey Floyd-Jones 12th U.S. Infantry (8 companies): ? 14th U.S. Infantry (9 companies): ? 5th New York (Duryee's Zouaves): Col Gouverneur K. Warren |
Sykes' Division was combined with Porter's Division of the Third Corps and McCall's Division of the First Corps to form the Fifth Corps (Provisional) on May 18, 1862.

## Other Troops from the Department of the Potomac

The following troops were part of the Department of the Potomac in March and April 1861, but were detached to maintain defense of the Potomac River line.

### I Corps

On April 4, the First Corps was renamed the Department of the Rappahannock, with authority to include the District of Columbia, Maryland between the Potomac and Patuxent, and Virginia between the Blue Ridge and the Fredericksburg & Richmond Railroad.
MG Irvin McDowell, Commanding  Ltc Edmund Schriver, Chief of Staff
Unattached cavalry
* 1st New York Cavalry: Col Andrew T. McReynolds
* 2nd New York Cavalry: Col J. Mansfield Davies
* 4th New York Cavalry: Col Christian F. Dickel
Sharpshooters
* 2nd Regiment, Berdan Sharpshooters: Col Henry A.V. Post
| Division | Brigade | Regiments and others |
| First Division   BG William B. Franklin | First Brigade     BG Philip Kearny until Apr 30 BG Georg W. Taylor | 1st New Jersey: Lt Col Robert McAllister 2nd New Jersey: Col Isaac M. Tucker 3rd New Jersey: Col George W. Taylor 4th New Jersey: Col James H. Simpson |
| First Division   BG William B. Franklin | Second Brigade   BG Henry Slocum | 16th New York: Col Joseph Howland 27th New York: Col Joseph J. Bartlett 5th Maine: Col Clark S. Edwards 96th Pennsylvania: Col Henry L. Cake |
| First Division   BG William B. Franklin | Third Brigade   BG John Newton | 18th New York: Col William H. Young 31st New York: Col Calvin E. Pratt 32nd New York: Col Roderick N. Matheson 95th Pennsylvania: Col John M. Gosline |
| First Division   BG William B. Franklin | Artillery  Cpt Edward R. Platt | Battery D, 2nd U.S. Artillery: Cpt Edward R. Platt Six Napoleons Battery A, Massachusetts Artillery: Cpt Josiah Porter Four 10-lb Parrotts, two 12-lb howitzers Battery A, New Jersey Artillery: Cpt William Hexamer Four 10-lb Parrotts, two 12-lb howitzers Battery F, 1st New York Artillery: Brady or Cpt William R. Wilson? Four 3-inch ordnance guns |
| Second Division   (Pennsylvania Reserves)   BG George A. McCall | First Brigade   BG John F. Reynolds | 1st Pennsylvania Reserves: Col R. Biddle Roberts 2nd Pennsylvania Reserves: Col William McCandless 5th Pennsylvania Reserves: Col Seneca G. Simmons 8th Pennsylvania Reserves: Col George S. Hays |
| Second Division   (Pennsylvania Reserves)   BG George A. McCall | Second Brigade   BG George Meade | 3rd Pennsylvania Reserves: Col Horatio G. Sickel 4th Pennsylvania Reserves: Col Albert L. Magilton 7th Pennsylvania Reserves: Col Elisha B. Harvey 11th Pennsylvania Reserves: Col Thomas F. Gallagher |
| Second Division   (Pennsylvania Reserves)   BG George A. McCall | Third Brigade   BG Edward Ord | 6th Pennsylvania Reserves: Col William Sinclair 9th Pennsylvania Reserves: Col Conrad F. Jackson 10th Pennsylvania Reserves: Col John S. McCalmont 12th Pennsylvania Reserves: Col John H. Taggart |
| Second Division   (Pennsylvania Reserves)   BG George A. McCall | Skirmishers | 1st Pennsylvania Reserve Rifles (Bucktails): Major Roy Stone |
| Second Division   (Pennsylvania Reserves)   BG George A. McCall | Artillery  Cpt Truman Seymour | Battery C, 5th U.S. Artillery: Cpt Truman Seymour Six Napoleons Battery A, 1st Pennsylvania Artillery: Cpt Hezekiah Easton Four Napoleons Battery B, 1st Pennsylvania Artillery: Cpt James H. Cooper Six 10-lb Parrotts Battery G, 1st Pennsylvania Artillery: Cpt Mark Kern Six 12-pounders |
| Third Division   BG Rufus King | First Brigade   BG Christopher C. Augur | 84th New York (14th Brooklyn): Col Edward Brush Fowler 22nd New York: Col Walter Phelps 24th New York: Col Timothy Sullivan 30th New York: Col Edward Frisby |
| Third Division   BG Rufus King | Second Brigade   BG Marsena R. Patrick | 80th New York: Col George W. Pratt 21st New York: Col William F. Rogers 23rd New York: Col Henry C. Hoffman 35th New York: Col William C. Brown |
| Third Division   BG Rufus King | Third Brigade   BG John Gibbon | 2nd Wisconsin: Col Edgar O'Connor 6th Wisconsin: Col Lysander Cutler 7th Wisconsin: Col William W. Robinson 19th Indiana: Col Solomon Meredith |
| Third Division   BG Rufus King | Artillery | Battery B, 4th U.S. Artillery: Lt Joseph B. Campbell Six Napoleons Battery D, 1st Rhode Island Artillery: Cpt John A. Monroe Six 10-lb Parrotts Battery A, New Hampshire Artillery: Cpt George A. Gerrish Six Napoleons Durell's Independent Battery (D), Pennsylvania Artillery: Cpt George W. Durrell? Six 10-lb Parrotts |
McCall's Division transferred to the Peninsula and was combined with Porter's Division of the Third Corps and Sykes' Division of the Reserve Corps to form the Fifth Corps (Provisional) on May 18, 1862. Franklin's Division transferred to the Peninsula and was combined with W.F. Smith's Division of the Fourth Corps to form the Sixth Corps (Provisional) on May 18, 1862.

### V Corps

On April 4, the Fifth Corps was renamed the Department of Shenandoah with authority over Maryland between the Blue Ridge and Flintstone Creek, Virginia between the Blue Ridge and the modern-day border with West Virginia.
MG Nathaniel P. Banks, Commanding  Cpt Louis H. Pelouze, Acting Assistant Adjutant General
Unattached Infantry
* 28th Pennsylvania: Col John W. Geary
* 4th Regiment Potomac Home Brigade (Maryland): ?
| Division | Brigade | Regiments and others |
| First Division   BG Alpheus S. Williams | First Brigade   Col Dudley Donnelly | 28th New York: Ltc Edwin F. Brown 5th Connecticut: Col George D. Chapman 46th Pennsylvania: Col Joseph F. Knipe 12th Indiana: ? 13th Massachusetts: Col Samuel H. Leonard |
| First Division   BG Alpheus S. Williams | Second Brigade   BG John Joseph Abercrombie | 12th Massachusetts: Col Fletcher Webster 2nd Massachusetts: Col George H. Gordon 16th Indiana: ? 1st Potomac Home Brigade (Maryland): Col William P. Maulsby Zouaves d'Afrique (one company): Cpt Charles H. T. Collis |
| First Division   BG Alpheus S. Williams | Third Brigade   Col George Henry Gordon | 83rd New York: Col John W. Stiles 29th Pennsylvania: Col John K. Murphy 27th Indiana: Col Silas Colgrove 3rd Wisconsin: Col Thomas H. Ruger |
| First Division   BG Alpheus S. Williams | Artillery  Cpt Clermont L. Best | Battery F, 4th U.S. Artillery: Cpt Clermont L. Best Six Napoleons 1st Maryland Battery (Independent Battery F, Pennsylvania Artillery): Cpt Robert B. Hampton Four 10-lb Parrotts 2nd Maryland Battery (Independent Battery C, Pennsylvania Artillery): Cpt James Thompson Four 10-lb Parrotts Battery F, 1st Pennsylvania Artillery: Cpt Ezra W. Matthews Six 3-inch ordnance guns Battery M, 1st New York: Cpt George W. Cothran Six 10-lb Parrotts Independent Battery E, Pennsylvania Artillery: Cpt Joseph E. Knapp Six 10-lb Parrotts 15th Independent Battery, New York Artillery: Cpt Henry J. McMahon Six 3-inch ordnance guns |
| Second Division   BG James Shields | First Brigade   Col Nathan Kimball | 14th Indiana: Ltc William Harrow 4th Ohio 8th Ohio: Col Samuel S. Carroll 67th Ohio: Col Alvin C. Voris? 7th Virginia: Col James Evans 84th Pennsylvania: Maj Walter Barrett |
| Second Division   BG James Shields | Second Brigade   Col Jeremiah C. Sullivan | 5th Ohio: Col Samuel H. Dunning 62nd Ohio: Col Francis Bates Pond 66th Ohio: Col Charles Candy 13th Indiana: Ltc Robert S. Foster 39th Illinois: Col Thomas O. Osborn |
| Second Division   BG James Shields | Third Brigade   Col Erastus B. Tyler | 7th Ohio: Ltc William R. Creighton 29th Ohio: Col Louis P. Buckley 7th Indiana: Col James Gavin 1st Virginia: Col Joseph Thoburn 110th Pennsylvania: Col William D. Lewis Andrew Sharpshooters: Cpt John Saunders |
| Second Division   BG James Shields | Artillery  Cpt Joseph C. Clark | Battery E, 4th U.S. Artillery: Cpt Joseph C. Clark Six 10-lb Parrotts Battery A, 1st Virginia Artillery: Cpt John Jenks Four 10-lb Parrotts, two Napoleons Battery B, 1st Virginia Artillery: Lt John V. Keeper Two 10-lb Parrotts Battery H, 1st Ohio Artillery: Cpt James F. Huntington Six 13-lb James Battery L, 1st Ohio Artillery: Cpt Frank C. Gibbs Two 12-lb howitzers, four Napoleons Battery, 4th Ohio Artillery |
| Cavalry | Unbrigaded | 1st Maine Cavalry: Col Samuel H. Allen 1st Vermont Cavalry: Col Lemuel Platt 1st Michigan Cavalry: Col Thornton F. Brodhead 1st Pennsylvania Cavalry: Col George D. Bayard 1st Rhode Island Cavalry: Col Alfred N. Duffié 5th New York Cavalry: Col Othniel De Forest 8th New York Cavalry: Col Samuel J. Crook Keys' Battalion, Pennsylvania Cavalry: Lt Hugh Keys Eighteen companies, Maryland Cavalry: Col Henry A. Cole One company, Virginia Cavalry: Col Henry Anisansel |
Shields' Division was transferred to the Department of the Rappahannock on May 10, 1862

### District of Washington

BG James S. Wadsworth, Commanding
| Regiments and others | Camp Location |
| 1st New Jersey Cavalry: Col William Halstead | Alexandria City |
| 4th Pennsylvania Cavalry: Col James H. Childs | East of the Capitol |
| 10th New Jersey: Col William Bryan | Bladensburg Road |
| 104th New York: Col John Rohrbach | Kalorama Heights |
| 1st Wisconsin Heavy Artillery: ? | Fort Cass (Alexandria Co.) |
| New York Artillery (three batteries): ? | Fort Ethan Allen (Alexandria Co.) Fort Marcy (Fairfax Co.) |
| Depot of New York Light Artillery: ? | Camp Barry |
| 2nd District of Columbia: Col Charles M. Alexander | Washington City |
| 26th Pennsylvania: Col William F. Small | G Street Wharf |
| 26th New York: Col William H. Christian | Fort Lyon (present-day Huntington) |
| 95th New York: Col George H. Biddle | Camp Thomas |
| 94th New York: Col Henry K. Viele Detachment of 88th Pennsylvania: Maj George W. Gile | Alexandria City |
| 91st Pennsylvania: Col Edgar I. Gregory | Franklin Square Barracks (Franklin Square) |
| 4th New York Heavy Artillery: Col T.D. Doubleday | Fort Carroll (present-day Joint Base Anacostia-Bolling) Fort Greble (also present-day JBAB) |
| 112th Pennsylvania: Col Charles Angeroth | Fort Saratoga |
| 76th New York: Ltc John D. Shaul | Fort Massachusetts (Washington Co.) |
| 59th New York: Col William L. Tidball | Fort Pennsylvania (Tenleytown) |
| Detachment of 88th Pennsylvania: ? | Fort Good Hope |
| 99th Pennsylvania: Col Peter Fritz | Fort Mahon |
| 2nd New York Light Artillery: ? | Fort Ward (present-day Alexandria) Fort Worth (present-day Alexandria) Fort Blenker (present-day Fairlington) |
| 107th Pennsylvania: Col Thomas A. Zeigel 54th Pennsylvania: Col Jacob M. Campbell | Kendall Green (present-day Gallaudet University) |
| Dickenson's Light Artillery (16th Independent New York Battery) 86th New York: Col Benajah P. Baily Detachment of 88th Pennsylvania: Col George P. McLean | East of the Capitol |
| 1st Massachusetts Heavy Artillery: Col Thomas R. Tannatt 56th Pennsylvania: Col Sullivan A. Meredith | Fort Albany Fort Tillinghast Fort Richardson Fort Runyon Fort Jackson Fort Barnard Fort Craig Fort Scott (all in present-day Arlington) |
| Detachment of 4th U.S. Artillery: ? 37th New York: Col John H. McCunn | Fort Washington (present-day Fort Washington, Maryland) |
| 97th New York: Col Charles W. Wheelock 101st New York: Col Enrico Fardella 91st New York: Col Jacob Van Sandt 12th Virginia: Col John B. Klunk | Fort Corcoran (present-day Rosslyn) |
Railroad Guards  Col Dixon S. Miles
* 6th New York Cavalry (Cos. A, B, C, E, G, I, K, & M dismounted): Col Thomas Devin
* 10th New York Cavalry (dismounted): Col John Lemmon
* 11th New York Cavalry (dismounted): Col James B. Swain
* 2nd Pennsylvania Cavalry (dismounted): Col Richard Butler Price

### Troops Around Baltimore

On March 22, the Middle Department was created with authority over Pennsylvania, New Jersey, Delaware, and the Eastern Shore of Maryland and Virginia, as well as the Maryland counties of Cecil, Hartford, Baltimore, and Anne Arundel. Dix remained in command.
MG John A. Dix, Commanding  Maj Daniel Tompkins Van Buren, Chief of Staff and Acting Assistant Adjutant General
| Type of Units | Regiments and others |
| Cavalry | 1st Maryland Cavalry: Cpt Henry A. Cole? Purnell (Maryland) Legion Cavalry: Cpt Robert E. Duvall |
| Artillery | Battery I, 2nd U.S. Artillery: Cpt Albert J.S. Molinard Battery A, Maryland Light Artillery: Cpt John W. Wolcott Battery L, 1st New York Artillery: Cpt John A. Reynolds Independent Battery ?, Pennsylvania Artillery: ? Independent Battery ?, Pennsylvania Artillery: ? |
| Infantry | 3rd New York: Col Samuel M. Alford 4th New York: Col Alfred W. Taylor 11th Pennsylvania: Col Richard Coulter 87th Pennsylvania: Col George Hay 111th Pennsylvania: Col Matthew Schlaudecker Detachment, 21st Massachusetts: ? 2nd Delaware: Col W. Henry Wharton 2nd Maryland: Col John Sommer 1st Eastern Shore Home Guard (Maryland): Col James Wallace 2nd Eastern Shore Home Guard (Maryland): Col Robert S. Rogers Purnell (Maryland) Legion Infantry: Col Samuel L. Graham |

## Department of Virginia

The Department of Virginia constituted an area 60 miles from Fort Monroe. McClellan had received permission to absorb it into his army as a division of the First Corps, but it was rescinded shortly after he arrived on the Peninsula.
MG John E. Wool, Commanding
| Location | Regiments and others |
| Fort Monroe   Maj Joseph Roberts | 10th New York: Col John E. Bendix 99th New York (2 cos.): Maj Richard Nixon 7th Independent Battery, Massachusetts Artillery: Cpt Phineas Alonzo Davis Detachment, 4th U.S. Artillery: ? 2nd Independent Battery, Wisconsin Artillery: Cpt Ernst F. Herzberg 4th Independent Battery, Wisconsin Artillery: Cpt John F. Vallee |
| Camp Hamilton   Col Max Weber | 1st Delaware: Col John W. Andrews 16th Massachusetts: Col Powell T. Wyman 1st Michigan: Col John C. Robinson 20th New York: Ltc Francis Weiss 99th New York (6 cos.): Col David W. Wardop 58th Pennsylvania: Col John R. Jones Battery D, 4th U.S. Artillery: Cpt Frederick M. Follett 11th Pennsylvania Cavalry: Col Joseph Harlan 1st New York Mounted Rifles (4 cos.): Maj Charles C. Dodge |
| Camp Butler   BG Joseph K. F. Mansfield | 20th Indiana: Col William L. Brown 5th Maryland: Col William L. Schley 29th Massachusetts: Col Ebenezer W. Peirce 1st New York: Col Garrett Dyckman 2nd New York: Col Joseph B. Carr 7th New York: Col Edward Kapff 11th New York: Col Charles McK. Loeser Battery L, 4th U.S. Artillery: Cpt Robert V.W. Howard |
| Fort Wool   Ltc Gustave B. Helleday | 99th New York (2 cos.): Ltc Gustave B. Helleday |