World History Maps Interactive Historical Atlas of the Civil War, detail page for:

Annapolis, US Army Department Apr 27, 1861 - Jul 19, 1861
Maryland, US Army Department Jul 19, 1861 - Jul 25, 1861

US Dept. of Annapolis created adjacent to B&O Railroad between Washington and Baltimore, Apr 27, 1861
Benjamin F. Butler Commander, Apr 27, 1861 - May 15, 1861
George Cadwalader Commander, May 15, 1861 - Jun 11, 1861
Nathaniel P. Banks Commander, Jun 11, 1861 - Jul 19, 1861
US Dept. of Annapolis renamed to Dept. of Maryland, Jul 19, 1861
John A. Dix Commander, Jul 19, 1861 - Jul 25, 1861
US Dept. of Maryland merged into Dept. of Pennsylvania, Jul 25, 1861