President Lincoln creates two new army departments, one directly protecting Washington DC

Peninsula Campaign commander George McClellan had wanted Major General Irvin McDowell's First Corps to join his march on Richmond and ordered its embarkation.  President Lincoln, fearing that this would strip thin the defenses of the capital, countermanded McClellan's order, and created two new army departments, the Department of the Rappahannock, with McDowell and his corps, included the District of Columbia, and the Department of the Shenandoah, with the Fifth Corps under Nathaniel Banks, then fighting in the Shenandoah Valley.  (By John Osborne)
Source Citation
Frank Moore, ed., The Rebellion Record: A Diary of American Events, with Documents, Narratives, Illustrative Incidents, Poetry, Etc. (New York: G.P. Putnam, 1862), IV: 77.
Peter Cozzens, Shenandoah, 1862: Stonewall Jackson's Valley Campaign (Chapel Hill, NC: University of North Carolina Press, 2008), 227-228. 
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