Gettysburg Union order of battle
The Union order of battle during the Battle of Gettysburg includes the American Civil War officers and men of the Army of the Potomac (multiple commander names indicate succession of command during the three-day battle (July 1–3, 1863)). Order of battle compiled from the army organization during the battle, the casualty returns and the reports. Army of the Potomac. MG George G. Meade, Commanding General Staff and Headquarters. General Staff: General Headquarters: Command of the Provost Marshal General: BG Marsena R. Patrick Guards and Orderlies: Engineer Brigade: BG Henry W. Benham I Corps. MG  John F. Reynolds (k) MG Abner Doubleday MG John Newton General Headquarters: II Corps. MG Winfield S. Hancock (w) BG John Gibbon BG William Hays General Headquarters: III Corps. MG Daniel E. Sickles (w) MG David B. Birney (w) V Corps. MG George Sykes General Headquarters: VI Corps. MG John Sedgwick General Headquarters: XI Corps. MG Oliver O. Howard MG Carl Schurz General Headquarters: XII Corps. MG Henry W. Slocum BG Alpheus S. Williams Provost Guard: Cavalry Corps. MG Alfred Pleasonton Headquarter Guards: Artillery Reserve. BG Robert O. Tyler Cpt James M. Robertson Headquarter Guard: Gettysburg Union order of battle