< to June • July 1861

Redesignated Department of Maryland July 19
Merged into the Department of Pennsylvania July 25

Commanded by
Major General Nathaniel P. Banks (until July 19)
Major General John A. Dix

On July 19 the Department’s name was changed to the Department of Maryland. On July 25 it was merged into the Department of Pennsylvania, the former forces from Maryland becoming Dix’s Division.

1st Delaware Infantry Regiment Colonel Henry H. Lockwood
6th Massachusetts Infantry Regiment Colonel Edward F. Jones
6th New York Militia Regiment Colonel Joseph Pinckney
13th New York State Militia Colonel Abel Smith
20th New York State Militia Colonel George W. Pratt
1st Pennsylvania Reserves Colonel R. Biddle Roberts to Harrisburg 7/23
12th Pennsylvania Infantry Regiment Colonel David Campbell
18th Pennsylvania Infantry Regiment Colonel William D. Lewis
19th Pennsylvania Infantry Regiment Colonel Peter Lyle
22nd Pennsylvania Infantry Regiment Colonel Turner G. Morehead
Cook’s Boston, Ma. Battery
2nd United States Artillery, Battery I