The Army of the Potomac existed during the American Civil War.
Emboldened by Second Bull Run, the Confederacy made its first invasion of the North with the Maryland Campaign
 Jefferson Davis and Johnston did not adopt the name, but it is clear that the organization of units as of March 14 was the same organization that Lee received on June 1, and thus it is generally referred to today as the Army of Northern Virginia, even if that is correct only in retrospect

