"PrimaryUnion ArmyinEastern Theater" . . . . . . . . . . "Army of Northeast Virginia" . "Department and Army of the Potomac" . . . . . . . . . . . . "Army of the Potomac's" . . . . . "Potomac Army's" . . . . . . . . . . . . . "armies of the Potomac" . . . . . . . . . . . "Union Army of the Potomac" . . "army" . . . . . . . . . "Army of the Potomac" . . "Department of the Potomac" . . . . . "Army of the Potomac" . "Potomac Army" . . . "Grant's army" . "the Potomac" . . . . . . . . . . "1865" . "1861" . . . . "Army of Northeastern Virginia" . . . . "1865-06-28" . . . . . . . . . . . . . . . . . "Union" . "Confederate Army of the Potomac" . "Commander of the Army of the Potomac" . . "1861" . . . . "AoP" . .