Army of the Potomac


noun U.S. History.

Union forces, trained and organized by Gen. George B. McClellan, that guarded Washington, D.C., against a Confederate invasion across the Potomac and fought battles in the eastern sector during the Civil War.
Confederate forces from the Alexandria, Potomac, and Shenandoah districts from mid–1861 to mid–1862: later known as Army of Northern Virginia.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019