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

The Susquehanna, US Army Department Jun 9, 1863 - Dec 1, 1864
Pennsylvania, US Army Department Dec 1, 1864 - after Jun 25, 1865

Gettysburg Campaign, Jun 3, 1863 - Aug 1, 1863
US Dept. of The Susquehanna created eastern Pennsylvania transferred from Middle Dept., Jun 9, 1863
Darius N. Couch Commander, Jun 9, 1863 - Dec 1, 1864
Hanover, Battle, Jun 30, 1863
Gettysburg, battle, Jul 1, 1863 - Jul 3, 1863

US Dept. of The Monongahela discontinued and merged into Dept. of the Susquehanna, Apr 6, 1864
US Dept. of The Susquehanna renamed to Dept. of Pennsylvania, Dec 1, 1864
George Cadwalader Commander, Dec 1, 1864 - after Jun 25, 1865