The War Department sets up two new Army Departments for the defense of Pennsylvania
With an expected Confederate movement against the state, the War Department set up two new Army Departments in Pennsylvania. The Department of the Monongahela, headquartered at Pittsburgh and under Major General William T.H. Brooks, was to include Pennsylvania west of Johnstown and several neighboring counties in Virginia and Ohio. The Department of the Susquehanna was to include everything to the east of that line, headquartered in Chambersburg and commanded by Major General Darius N. Couch. (By John Osborne)
War Department, Thomas M. O'Brien, Oliver Diefendorf (eds), General Orders of the War Department, Embracing the years 1861, 1862, 1863 ... (New York: Derby and Miller, 1864), 197.