< to February • March 1864 • to April >
Commanded by Major General C. C. Augur
| Defences North of the Potomac | Lieutenant Colonel Joseph A. Haskins | |
| First Brigade | Colonel August A. Gibson (to 3/26) Colonel James M. Warner |
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| 2nd Pennsylvania Heavy Artillery | to Defenses S. Potomac (below) | |
| 1st Vermont Heavy Artillery | Colonel James M. Warner (^) | |
| Second Brigade | Colonel Lewis O. Morris | |
| 1st Maine Heavy Artillery | ||
| 7th New York Heavy Artillery | Colonel Lewis O. Morris | |
| 9th New York Heavy Artillery | ||
| 9th New York Independent Battery | ||
| Third Brigade | Colonel Alexander Piper (to 3/26) Colonel J. Welling |
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| 10th New York Heavy Artillery | to Defenses S. Potomac (below) | |
| Defences South of the Potomac | Brigadier General Gustavus A. DeRussy |
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| First Brigade | Colonel T. R. Tannatt (to 3/6) Colonel August A. Gibson |
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| 1st Massachusetts Heavy Artillery | ||
| 2nd New York Heavy Artillery | ||
| 2nd Pennsylvania Heavy Artillery | Colonel August A. Gibson | from Defenses N. Pot. (above) |
| Second Brigade | Colonel H. L. Abbot (to 3/26) Colonel T. R. Tannatt |
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| 1st Connecticut Heavy Artillery | Colonel Henry L. Abbott | to 4 Brig. (below) |
| 2nd Connecticut Heavy Artillery | Colonel Leverette Wessells | to 4 Brig. (below) |
| Third Brigade | Colonel J.C. Tidball (to 3/26) Colonel Alexander Piper |
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| 4th New York Heavy Artillery | ||
| 10th New York Heavy Artillery | from Defenses N. Pot. (above) | |
| 1st Wisconsin Heavy Artillery, Bat. A | from 4 Brig. (below) | |
| Fourth Brigade | Major L. Schamberger (to 2/12) Colonel L. Schirmer |
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| 1st Connecticut Heavy Artillery | Colonel Henry L. Abbott | from 2 Brig. (above) |
| 2nd Connecticut Heavy Artillery | Colonel Leverette Wessells | from 2 Brig. (above) |
| 2nd Massachusetts Cavalry Regiment | ||
| 15th New York Heavy Artillery | Major L. Schamberger | to Army Potomac Art. Res. |
| 1st Wisconsin Heavy Artillery, Bat. A | to 3 Brig. (above) | |
| Tyler’s (King’s) Division | Brigadier General Robert O. Tyler |
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| 1st Brigade (“Corcoran Legion”) | Colonel Mathew Murphy |
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| 155th New York Infantry Regiment | ||
| 164th New York Infantry Regiment | Colonel James McMahon | |
| 170th New York Infantry Regiment | Colonel James D. McIvor | |
| 182nd New York Infantry Regiment | Lieutenant Colonel Thomas M. Reid | |
| Not Brigaded | ||
| 17th New York Independent Battery | to Camp Barry (below) | |
| 157th Pennsylvania Infantry | ||
| District of Washington | Brigadier General J. H. Martindale |
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| 1st District of Columbia Cavalry Regiment | ||
| 2nd District of Columbia Infantry Regiment | Colonel Charles M. Alexander | |
| 150th Pennsylvania Infantry, Co. K | Captain David Derickson | Lincoln’s Bodyguard |
| 1st Regiment Invalid Corps/Veteran Reserve Corps | Colonel R.H. Rush | redesignated 3/18: to 1 Brig. 3/23 |
| 6th Regiment Invalid Corps./Veteran Reserve Corps | Colonel M.N. Wisewell | redesignated 3/18: to 1 Brig. 3/23 |
| 9th Regiment Invalid Corps/Veteran Reserve Corps | Colonel G.W. Gile | redesignated 3/18: to 1 Brig. 3/23 |
| First Brigade | Colonel R.H. Rush | created 3/23 |
| 1st Regiment Veteran Reserve Corps | Colonel R.H. Rush | from Dist. Washington |
| 6th Regiment Veteran Reserve Corps | Colonel M.N. Wisewell | from Dist. Washington |
| 9th Regiment Veteran Reserve Corps | Colonel G.W. Gile | from Dist. Washington |
| 19th Regiment Veteran Reserve Corps | from new org. | |
| 22nd Regiment Veteran Reserve Corps | from new org. | |
| 24th Regiment Veteran Reserve Corps | from new org. | |
| District of Alexandria | Colonel H. H. Wells (to 12/5) Brigadier General John P. Slough |
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| Slough’s Independent Brigade | ||
| 4th Delaware Infantry Regiment | Colonel A.H. Grimshaw | |
| 1st District of Columbia Infantry Regiment | ||
| 5th New York Veteran Infantry Regiment | Lieutenant Colonel Cleveland Winslow | |
| Pennsylvania Independent Battery H | Captain William Borrowe | |
| Second Brigade, Pennsylvania Reserves | Colonel Horatio G. Sickel |
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| 3rd Pennsylvania Reserves Regiment | Lieutenant Colonel John Clark | |
| 7th Pennsylvania Reserves Regiment | Colonel Henry C. Bolinger | |
| 8th Pennsylvania Reserves Regiment | Colonel Silas M. Baily | |
| Independent Cavalry Brigade | Colonel C. R. Lowell, Jr. Colonel H.M. Lazelle |
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| 2nd Massachusetts Cavalry Regiment | ||
| 13th New York Cavalry (Companies A-F) | Lieutenant Colonel Henry S. Gansevoort | |
| 16th New York Cavalry (Companies A-D) | ||
| Light Artillery Camp (Camp Barry) | ||
| 1st Maine Light Artillery | from Veteran Furlough April | |
| 2nd Maine Light Artillery | ||
| 3rd Maine Light Artillery | ||
| 7th Maine Light Artillery | ||
| Maryland Battery A | from Army Potomac 1 Corps Art. | |
| 11th Massachusetts Battery | ||
| 13th Michigan Independent Battery | ||
| 14th Michigan Independent Battery | ||
| 3rd New Jersey Battery | ||
| 4th New Jersey Battery | ||
| 5th New Jersey Battery | ||
| 1st New York Artillery, Battery F | ||
| 1st New York Artillery, Battery K | from Army Potomac Art. Res. | |
| 10th New York Independent Battery | Lieutenant Charles T. Bruen | |
| 17th New York Independent Battery | from King’s Div. (above) | |
| 19th New York Independent Battery | . | |
| 27th New York Independent Battery | ||
| 33rd New York Independent Battery | . | to Dept. Va. & NC., Yorktown |
| 1st Pennsylvania Artillery, Battery G | from Army Potomac 2 Corps Art. | |
| 1st Pennsylvania Artillery, Battery H | ||
| 1st Pennsylvania Artillery, Battery I | Captain Robert J. Nevin | |
| Pennsylvania Independent Battery C | from Army Potomac 2 Corps Art. | |
| Pennsylvania Independent Battery F | from Army Potomac 2 Corps Art. | |
| 1st Rhode Island Artillery, Battery H | ||
| 3rd Vermont Battery | ||
| 1st West Virginia Artillery, Battery C | from Army Potomac Art. Res. | |
| 5th United States Artillery, Battery D | to Army Potomac, 5 Corps Artillery | |
| 5th United States Artillery, Battery F | ||
| 5th United States Artillery, Battery I | ||
| 5th United States Artillery, Battery L |