World History Maps Interactive Historical Atlas of the Civil War, detail page for:

US Army of the Potomac First Corps, Mar 17, 1862 - Jun 26, 1862
US Army of the Potomac, First Corps, Mar 17, 1862 - Jun 26, 1862

Irvin McDowell Commander, Mar 13, 1862 - Apr 4, 1862
Joseph Hooker Commander, Apr 4, 1862 - Sep 17, 1862