United States Army > Army of the Potomac

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Commanded by Brigadier General Fitz John Porter

The Pennsylvania Reserves Division was transferred from the Department of the Rappahannock to become the 3rd Division of the Fifth Corps on June 18.

First Division

Brigadier General George W. Morrell
First Brigade Brigadier General J. H. Martindale
2nd Maine Infantry Regiment Colonel Charles W. Roberts
18th Massachusetts Infantry Regiment Colonel James Barnes
22nd Massachusetts Infantry Regiment Colonel Jesse A. Grove
1st Michigan Infantry Regiment Colonel Horace S. Roberts from Dept. VA, Newport News
13th New York Infantry Regiment Colonel Elisha G. Marshall
25th New York Infantry Regiment Colonel Charles A. Johnson
Second Brigade Colonel James McQuade (to 6/26) 
Brigadier General Charles Griffin
9th Massachusetts Infantry Regiment Colonel Thomas Cass
4th Michigan Infantry Regiment Colonel Dwight A. Woodbury
14th New York Infantry Regiment Colonel James McQuade
62nd Pennsylvania Infantry Regiment Colonel Samuel W. Black (k 6/27)
Colonel Jacob B. Sweitzer
Third Brigade Brigadier General Daniel Butterfield (w 6/27)
16th Michigan Infantry Regiment Colonel Thomas Stockton (c 6/27)
Lieutenant Colonel John Ruehle (res.)
Major Norval Welch
12th New York Infantry Regiment Colonel Henry A. Weeks
17th New York Infantry Regiment Colonel H. Seymour Lansing
44th New York Infantry Regiment Colonel Stephen W. Stryker
83rd Pennsylvania Infantry Regiment Colonel John W. McLane (k 6/27)
Colonel Strong Vincent
1st United States Sharpshooters Colonel Hiram Berdan
Division Artillery
3rd Massachusetts Battery
5th Massachusetts Battery
1st Rhode Island Artillery, Battery C
5th United States Artillery, Battery D

Second Division

Brigadier General George Sykes
First Brigade Lieutenant Colonel R. C. Buchanan
3rd United States Infantry Regiment
4th United States Infantry Regiment
12th United States Infantry Regiment
14th United States Infantry Regiment
Second Brigade Lieutenant Colonel William Chapman (to 6/27)
Major Charles S. Lovell (to 6/29)
Lieutenant Colonel William Chapman
2nd United States Infantry Regiment
6th United States Infantry Regiment
10th United States Infantry Regiment
11th United States Infantry Regiment
17th United States Infantry Regiment
Third Brigade Colonel Gouverneur K. Warren
5th New York Infantry Regiment
10th New York Infantry Regiment
1st Connecticut Heavy Artillery
Division Artillery
3rd United States Artillery, Batteries L&M
5th United States Artillery, Battery I

Third Division

Brigadier General George A. McCall (c 6/30)
Brigadier General Truman Seymour 
from Dept. of the Rappahannock 6/18
First Brigade Brig. Gen. John Reynolds (c 6/27)
Colonel S. G. Simmonds (6/27 – 6/30)
Colonel R. B. Roberts (after 6/30)
1st Pennsylvania Reserves Colonel Richard B. Roberts
2nd Pennsylvania Reserves Colonel William McCandless
5th Pennsylvania Reserves Colonel Seneca Simmons (mw 6/30)
8th Pennsylvania Reserves Colonel George S. Hays to 2 Brig. (below)
Second Brigade Brigadier General George Meade (w 6/30)
Colonel A. L. Magilton (after 6/30)
3rd Pennsylvania Reserves Colonel Horatio G. Sickel
4th Pennsylvania Reserves Colonel Albert L. Magilton
7th Pennsylvania Reserves Colonel Elisha B. Harvey
8th Pennsylvania Reserves Colonel George S. Hays from 1 Brig. (above)
11th Pennsylvania Reserves Colonel Thomas F. Gallagher
Third Brigade Brigadier General Truman Seymour (^ 6/30)
Colonel C. F. Jackson (after 6/30)
6th Pennsylvania Reserves Colonel William Sinclair
9th Pennsylvania Reserves Colonel Conrad F. Jackson
10th Pennsylvania Reserves Colonel John S. McCalmont
12th Pennsylvania Reserves Colonel John H. Taggart
13th Pennsylvania Reserves Colonel Hugh McNeil
Division Artillery and Cavalry
Battery A, 1st Pennsylvania Artillery
Battery B, 1st Pennsylvania Artillery Captain James H. Cooper
Battery G, 1st Pennsylvania Artillery
Battery C, 5th United States Artillery Captain Dunbar H. Ransom
1st Pennsylvania Cavalry Colonel George D. Bayard to Dept. Rapahannock, Shield’s Div.

Artillery Reserve

Colonel Henry Hunt from Army Artillery Reserve
First Brigade Horse Artillery
2nd United States Artillery, Battery A
2nd United States Artillery, Batteries B&L
2nd United States Artillery, Battery M
3rd United States Artillery, Batteries C&G
Second Brigade 
1st United States Artillery, Battery E
1st United States Artillery, Battery G
1st United States Artillery, Battery K
4th United States Artillery, Battery G
5th United States Artillery, Battery A
5th United States Artillery, Battery K
Third Brigade 
1st New York Artillery Bn., Battery A Captain Thomas H. Bates
1st New York Artillery Bn., Battery B Captain Rufus T. Pettit
1st New York Artillery Bn., Battery C
1st New York Artillery Bn., Battery D Captain Thomas W. Osborn
Fourth Brigade
Maryland Artillery, Battery A
Maryland Artillery, Battery B
Fifth Brigade
2nd United States Artillery, Battery E
3rd United States Artillery, Batteries F&K
5th New York Independent Battery