< to June • July 1862 • to August >
Commanded by Major General John Wool
On July 22 the troops of the Middle Department were organized as the 8th Corps.
| Defences of Baltimore | Colonel W. H. Morris | |
| 17th Indiana Battery | from Indiana | |
| 1st Maryland Infantry Regiment | Colonel John R. Kenly | |
| Purnell Legion Cavalry (Maryland) | ||
| 5th New York Heavy Artillery | Colonel Samuel Graham | |
| 7th New York State Militia | Colonel Marshall Lefferts | |
| 19th New York State Militia | Colonel William R. Brown | |
| 22nd New York State Militia | Colonel James Monroe (d 7/21) Lt. Colonel Lloyd Aspinwall |
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| 37th New York State Militia | Colonel Charles Roome | |
| 47th New York State Militia | Colonel Jeremiah V. Meserole | |
| 67th Pennsylvania Infantry Regiment | Colonel John F. Staunton | to Annapolis (below) |
| 87th Pennsylvania Infantry Regiment | Colonel George Hay | |
| 13th Pennsylvania Cavalry Regiment | Lt. Colonel James Galligher | |
| 2nd United States Artillery, Battery I | at Fort McHenry | |
| Annapolis | ||
| Purnell Legion Cavalry (Maryland) Co. B | from Defences Baltimore (above) | |
| 67th Pennsylvania Infantry Regiment | Colonel John F. Staunton | from Defences Baltimore (above) |
| District of the Eastern Shore | Henry H. Lockwood | |
| 1st Maryland Eastern Shore Regiment | Colonel David P. DeWitt | |
| 2nd Maryland Eastern Shore Regiment | Colonel Edward Wilkins | |
| Purnell Legion Cavalry (Maryland) Co. A | from Defences Baltimore (above) | |
| Railroad District | Brigadier General Benjamin F. Kelly | |
| 23rd Illinois Infantry Regiment | from Mountain Department, Railroad District | |
| 65th Illinois Infantry Regiment | from Mountain Department, Railroad District | |
| 1st Maryland Potomac Home Brig. | Colonel William P. Maulsby | from Railroad Brigade (below) |
| 2nd Maryland Potomac Home Bde. | Colonel Robert Bruce | from Mountain Department, Railroad District |
| Loudon Va. Rangers | organized 6/20 | |
| 84th Ohio Infantry Regiment | Colonel William Lawrence | from Mountain Department, Railroad District |
| 86th Ohio Infantry Regiment | Colonel Barnabas Burns | from Mountain Department, Railroad District |
| 54th Pennsylvania Infantry Regiment | Colonel Jacob M. Campbell | from Railroad Brigade (below) |
| 87th Pennsylvania Infantry Regiment | Colonel George Hay | from Defences Baltimore (above) |
| Ringgold Pennsylvania Cavalry | from Mountain Department, Railroad District | |
| Washington Co. Pennsylvania Cavalry | from Mountain Department, Railroad District | |
| 6th West Virginia Infantry Regiment | Colonel Nathan Wilkinson | from Mountain Department, Railroad District |
| 10th West Virginia Infantry Regiment | Colonel Thomas M. Harris | from Mountain Department, Railroad District |
| 11th West Virginia Infantry Regiment | Colonel John C. Rathbone | from Mountain Department, Railroad District |
| 1st Illinois Artillery, Battery L | from Mountain Department, Railroad District | |
| West Virginia Artillery, Battery F | from Mountain Department, Railroad District | |
| West Virginia Artillery, Battery G | from Mountain Department, Railroad District | |
| Railroad Brigade | Colonel Dixon S. Miles | |
| 2nd Illinois Artillery, Battery M | ||
| 1st Maryland Potomac Home Brig. | Colonel William P. Maulsby | |
| 1st Maryland Potomac Home Brig. Cavalry | Captain Henry A. Cole | |
| 3rd Maryland Potomac Home Brig. | ||
| 4th Maryland Potomac Home Brig. | Colonel William J.L. Nicodemus | |
| Patapsco Maryland Guard | Colonel James W. McMillan | |
| 8th New York Cavalry Regiment | Colonel Benjamin F. Davis | |
| 5th New York Heavy Artillery, Cos. A&F | ||
| 12th New York State Militia | ||
| 32nd Ohio Infantry Regiment | Colonel Thomas H. Ford | from Army of Virginia, Piatt’s Brig. |
| 60th Ohio Infantry Regiment | Clonel William H. Trimble | from Army of Virginia, Piatt’s Brig. |
| 87th Ohio Infantry Regiment | Colonel Henry B. Banning | from Ohio |
| 54th Pennsylvania Infantry Regiment | Colonel Jacob M. Campbell | to Railroad District (see above) |