| Defences North of the Potomac |
Lieutenant Colonel Joseph A. Haskin |
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| First Brigade |
Colonel J. M. Warner (to 5/12)
Colonel W. H. Hayward |
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| 1st Maine Heavy Artillery, Co. M |
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| 2nd Pennsylvania Heavy Artillery |
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| 1st Vermont Heavy Artillery |
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| Second Brigade |
Colonel Lewis O. Morris |
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| 16th Indiana Battery |
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to 2 Brig.,DeRussy’s Div. (below) |
| 1st Maine Heavy Artillery |
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| 7th New York Heavy Artillery |
Colonel Lewis O. Morris |
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| 9th New York Heavy Artillery |
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| 9th New York Independent Battery |
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| Third Brigade |
Colonel A. Piper |
|
5th New York Heavy Artillery,
Companies A, I, K, L & M |
|
to Defences S. of the Potomac, 1st Brig. (below) |
| 10th New York Heavy Artillery |
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|
| Defences South of the Potomac |
Colonel T. R. Tannatt (to 5/25)
Brigadier General Gustavus A. DeRussy
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| First Brigade |
Colonel T. R. Tannatt |
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| 1st Massachusetts Heavy Artillery |
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| 2nd New York Heavy Artillery |
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| 3rd New York Heavy Artillery Battalion |
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to 3rd Bde. (below) |
| 4th New York Heavy Artillery |
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|
5th New York Heavy Artillery,
Companies I,K,L&M |
|
from 3 Brig., Def. N. Potomac (above) |
| 1st Wisconsin Heavy Artillery, Bat. A |
|
to 3rd Brig. (below) |
| Second Brigade |
Colonel G. D. Wells (to 5/63)
Colonel L. W. Wessells |
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| 1st Connecticut Heavy Artillery |
|
to 3rd Bde. (below) |
| 19th Connecticut Infantry Regiment |
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|
| 16th Indiana Battery |
|
from 2 Brig. Haskin’s Div. (above) |
| 34th Massachusetts Infantry Regiment |
|
to District Washington (below) |
| 3rd New York Heavy Artillery Battalion |
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from 1st Brig. (above) |
| |
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| 16th West Virginia Infantry Regiment |
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| Third Brigade |
Colonel H. L. Abbot |
organized 5/12 |
| 1st Connecticut Heavy Artillery |
|
from 2nd Bde. (see above) |
| 178th New York Infantry Regiment |
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| 1st Rhode Island Artillery, Battery H |
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from Abercrombie’s Div. (below) |
| 1st Wisconsin Heavy Artillery, Bat. A |
|
from 1st Brig. (above) |
| Abercrombie’s Division |
Brigadier General J. J. Abercrombie |
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| First Brigade |
Colonel Francis Fessenden |
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| 25th Maine Infantry Regiment |
Colonel Francis Fessenden |
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| 27th Maine Infantry Regiment |
Colonel Mark F. Wentworth |
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| Second Brigade |
Brigadier General George J. Stannard |
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| 12th Vermont Infantry Regiment |
Colonal Asa P. Blunt |
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| 13th Vermont Infantry Regiment |
Colonel Francis V. Randall |
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| 14th Vermont Infantry Regiment |
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| 15th Vermont Infantry Regiment |
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| 16th Vermont Infantry Regiment |
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| Third Brigade |
Colonel George L. Willard (to 5/6)
Brigadier General Alexander Hays |
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| 39th New York Infantry Regiment |
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| 111th New York Infantry Regiment |
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| 125th New York Infantry Regiment |
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| 126th New York Infantry Regiment |
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| Artillery |
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| 9th Massachusetts Battery |
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| 17th New York Independent Battery |
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| 2nd Connecticut Independent Battery |
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| 11th Massachusets Independent Battery |
|
mustered out 5/29 |
| 1st Rhode Island Light Artillery, Battery H |
|
to Defences S. Potomac 3rd Brig. |
| Keystone (Pennsylvania) Battery |
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| Pennsylvania Reserves Division |
Brigadier General Samuel W. Crawford |
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| First Brigade |
Colonel William Sinclair (to 5/29)
Colonel William McCandless |
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| 1st Pennsylvania Reserves Regiment |
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| 2nd Pennsylvania Reserves Regiment |
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| 6th Pennsylvania Reserves Regiment |
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| 13th Pennsylvania Reserves Regiment |
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| Third Brigade |
Colonel J. W. Fisher |
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| 5th Pennsylvania Reserves Regiment |
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| 9th Pennsylvania Reserves Regiment |
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| 10th Pennsylvania Reserves Regiment |
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| 11th Pennsylvania Reserves Regiment |
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| 12th Pennsylvania Reserves Regiment |
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| Cavalry Division |
Major General Julius Stahel |
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| First Brigade |
Brigadier General J. T. Copeland |
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| 5th Michigan Cavalry Regiment |
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| 6th Michigan Cavalry Regiment |
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| 7th Michigan Cavalry Regiment |
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| Second Brigade |
Colonel R. Butler Price |
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| 1st Michigan Cavalry Regiment |
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| 1st Ohio Cavalry Cos. A&C |
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| 2nd Pennsylvania Cavalry Regiment |
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| 18th Pennsylvania Cavalry Regiment |
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from 3rd Brig. (below) |
| 1st Vermont Cavalry Regiment |
|
to 3rd Brig. (below) |
| Third Brigade |
Colonel O. DeForest |
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| 5th New York Cavalry Regiment |
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| 18th Pennsylvania Cavalry Regiment |
|
to 2nd Brig. (above) |
| 1st Vermont Cavalry Regiment |
|
from 2nd Brig. (above) |
| 1st West Virginia Cavalry Regiment |
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| Artillery |
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|
| 1st Michigan Artillery, Battery I |
Captain Jabez Daniels |
from Camp Berry (below) |
| Jewett’s Independent Brigade |
Colonel A. B. Jewett |
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| 14th New Hampshire Infantry Regiment |
Colonel Robert Wilson |
to District Washington (below) |
| 39th Massachusetts Infantry Regiment |
Colonel P. Stearns Davis |
to District Washington (below) |
| 23rd Maine Infantry Regiment |
Colonel William W. Virgin |
to District Alexandria (below) |
| 10th Vermont Infantry Regiment |
Colonel Albert B. Jewett |
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| 11th New York Cavalry, Cos. E, F & I |
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| 10th Massachusetts Independent Battery |
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| District of Washington |
Brigadier General J. H. Martindale |
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| 2nd District of Columbia Infantry Regiment |
Colonel Charles M. Alexander |
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| 14th New Hampshire Infantry Regiment |
Colonel Robert Wilson |
from Jewitt’s Ind. Brig. (above) |
| 34th Massachusetts Infantry Regiment |
Colonel George D. Wells |
from Defenses South of Potomac (above) |
| 39th Massachusetts Infantry Regiment |
Colonel P. Stearns Davis |
from Jewitt’s Ind. Brig. (above) |
| 27th Pennsylvania Infantry, Co. F |
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| 150th Pennsylvania Infantry, Co. K |
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| 157th Pennsylvania Infantry (4 cos.) |
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| District of Alexandria |
Brigadier General John P. Slough |
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| Slough’s Independent Brigade |
Brigadier General John P. Slough |
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| 1st District of Columbia Infantry Regiment |
|
|
| 23rd Maine Infantry Regiment |
Colonel William W. Virgin |
from Jewitt’s Ind. Brig. (above) |
| 153rd New York Infantry Regiment |
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| Second Brigade, Pennsylvania Reserves |
Colonel H. C. Bollinger |
from PA Reserves Div. (above) |
| 3rd Pennsylvania Reserves Regiment |
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| 4th Pennsylvania Reserves Regiment |
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| 7th Pennsylvania Reserves Regiment |
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| 8th Pennsylvania Reserves Regiment |
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| Artillery Brigade South of the Potomac |
Colonel M. Cogswell |
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| 1st Massachusetts Heavy Artillery |
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|
| 34th Massachusetts Infantry Regiment |
Colonel George D. Wells |
to Distict of Washington (above) |
| 2nd New York Heavy Artillery |
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| 3rd New York Heavy Artillery Battalion |
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| 1st Wisconsin Heavy Artillery |
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| Light Artillery Camp (Camp Barry) |
Brigadier General William F. Barry |
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| 9th Michigan Battery |
Captain Jabez Daniels |
to Cav. Div. (above) |
| 10th Michigan Battery |
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| 1st New York Artillery, Battery A |
. |
|
| 12th New York Independent Battery |
. |
|
| 19th New York Independent Battery |
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| 27th New York Independent Battery |
. |
|
| 12th Ohio Independent Battery |
|
from Army Potomac Art. Res. |
| 1st West Virginia Artillery, Battery A |
. |
|
