| Defences North of the Potomac |
Brigadier General Martin D. Hardin
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| First Brigade |
Colonel C.H. Long
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| New Hampshire Heavy Artillery |
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| 13th Michigan Independent Battery |
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| 4th United States Artillery, Battery A |
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| Second Brigade |
Colonel W.S. Abert
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| 3rd Massachusetts Heavy Artillery |
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| New Hampshire Heavy Artillery Company L |
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| Third Brigade |
Major C.S. Worcester |
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| Massachusetts Heavy Artillery, 3 Cos. |
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| 14th Michigan Independent Battery |
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| Fort Foote |
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| 1st Pennsylvania Artillery, Battery G |
Lieutenant Eugene Moore |
from Dept WV 3 Div. |
| 2nd United States Artillery, Battery I |
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| 3rd United States Artillery, Battery G |
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| Defences South of the Potomac |
Brigadier General Gustavus A. DeRussy
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| First Brigade |
Colonel J.N.G. Whistler
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| 16th Indiana Battery |
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| Maryland Artillery, Battery D |
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| 1st New York Artillery, Battery F |
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| 1st New York Artillery, Battery K |
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| 1st Pennsylvania Artillery, Battery H |
Captain Andrew Fagan |
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| 6th Pennsylvania Heavy Artillery, Cos. E&H |
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| Pennsylvania Independent Battery I |
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| 1st United States Artillery, Batteries A&F |
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| 1st United States Artillery, Battery E |
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| 2nd United States Artillery, Battery G |
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| 1st West Virginia Artillery, Battery C |
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| Second Brigade |
Colonel Charles Barnes |
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| 6th Pennsylvania Heavy Artillery (6 cos.) |
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| Third Brigade |
Colonel W.S. King
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| 4th Massachusetts Heavy Artillery |
Colonel W.S. King |
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| 6th Pennsylvania Heavy Artillery, Cos. C&M |
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| Fourth Brigade |
Colonel C.C. Meservey |
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| 1st Wisconsin Heavy Artillery, Cos. E-M |
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| District of Washington |
Colonel M. N. Wisewell |
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| 150th Pennsylvania Infantry, Co. K |
Captain David Derickson |
Lincoln’s Bodyguard |
| 1st Brigade |
Colonel G. W. Gile
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| 1st Regiment Veteran Reserve Corps |
Colonel R.H. Rush |
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| 4th Regiment Veteran Reserve Corps |
Colonel M.N. Wisewell |
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| 6th Regiment Veteran Reserve Corps |
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| 7th Regiment Veteran Reserve Corps |
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| 9th Regiment Veteran Reserve Corps |
Colonel G.W. Gile |
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| 10th Regiment Veteran Reserve Corps |
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| 18th Regiment Veteran Reserve Corps |
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| 19th Regiment Veteran Reserve Corps |
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| 21st Regiment Veteran Reserve Corps |
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| 22nd Regiment Veteran Reserve Corps |
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| 24th Regiment Veteran Reserve Corps |
Colonel W.H. Browne |
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| District of Alexandria |
Brigadier General John P. Slough
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| 1st District of Columbia Infantry Regiment |
|
merged w/ 2 DC Inf. (below) |
| 2nd District of Columbia Infantry Regiment |
Colonel William Graham |
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| 26th Michigan Infantry, Company F |
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| 201st Pennsylvania Infantry Regiment |
Colonel F. Asbury Awl |
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| 12th Regiment Veteran Reserve Corps |
Colonel A. Farnsworth |
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| 3rd United States Artillery, Battery L |
|
from Camp Barry |
| St. Mary’s Point District |
Brigadier General James Barnes |
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| 5th Massachusetts Cavalry Regiment |
|
to Army James, 25 Corps |
| 2nd Wisconsin Battery |
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| First Separate Brigade |
Colonel William Gamble
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| 8th Illinois Cavalry Regiment |
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| 16th Massachusetts Battery |
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| 13th New York Cavalry (Companies A-F) |
Lieutenant Colonel Henry S. Gansevoort |
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| 16th New York Cavalry (Companies A-D) |
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| 5th Pennsylvania Heavy Artillery |
Colonel George S. Gallupe |
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| 202nd Pennsylvania Infantry Regiment |
Colonel Charles Albright |
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| Light Artillery Camp (Camp Barry) |
Major J.A. Hall |
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| Baltimore MD Independent Battery |
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| 30th New York Independent Battery |
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| Pennsylvania Independent Battery H |
Captain William Borrowe (dis. 3/8)
Captain Edward Nevin |
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| West Virginia Battery E |
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| 3rd United States Artillery, Battery I |
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| 4th United States Artillery, Battery A |
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| 4th United States Artillery, Batteries F&H |
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| 4th United States Artillery, Battery G |
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| 5th United States Artillery, Battery I |
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| 5th United States Artillery, Battery M |
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