Harper's Weekly cover, July 11, 1863: "Major-General George G. Meade, the New Commander of the Army of the Potomac — Photographed by Brady"
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,[1] the casualty returns[2] and the reports.[3]
11th New Jersey: Col Robert McAllister (w), Maj Philip J. Kearny (mw), Cpt Luther Martin (k), Lt John Schoonover (w), Cpt William H. Lloyd (w), Cpt Samuel T. Sleeper, Lt John Schoonover
^detachments from 1st, 2nd, 5th, and 6th Regiments
^not engaged. With the exception of the regular battalion, it was July 1, and while at Beaver Dam Creek (Maryland), ordered to Washington D.C., where it arrived July 3.
^Major General Reynolds was killed July 1, while in command of the left wing of the army (I, III, and XI Corps and First Division, Cavalry Corps)
^Major General Doubleday commanded the Corps July 1, and Major General Newton, who was assigned to that command on the 1st [1][2], superseded him July 2
^transferred, in afternoon of July 1, to the First Brigade
^arrived on the evening of July 1 and did not take part on the first day of the battle [3]; 12th Vermont and 15th Vermont were detached as train guard
^After the death of General Reynolds, General Hancock was assigned to the command of all troops on the field of battle [4], relieving General Howard, who had succeeded General Reynolds. General Gibbon, of the Second Division, assumed command of the corps. These assignments terminated on the evening of July 1. Similar changes in commanders occurred during the battle of the 2nd, when General Hancock was put in command of the Third Corps in addition to that of his own. He was wounded on the 3rd, and Brigadier General William Hays [5] was assigned to the command of the corps.
^under the command of General Patrick (Provost Marshal General of the Army) during the battle [6]
^Col McKeen was placed in temporary command of the 148th Pennsylvania Infantry because Colonel James Addams Beaver was ill. Col Edward E. Cross believed that Ltc McFarlane was too inexperienced to lead the regiment.
^The 102nd Pennsylvania Infantry guarded the wagon trains at Westminster, and was not engaged in the battle. However, a detachment of 103 men commanded by Lt Robert W. Lyon was sent as a guard with a supply train and placed on defensive line north of Round Top.
^During the interval between the death of General Reynolds and the arrival of General Hancock on the afternoon of July 1, all the troops on the field of battle were commanded by General Howard, General Schurz taking command of the Eleventh Corps, and General Schimmelfennig of the Third Division
^Exercised command of the right wing of the army during a part of the battle. But see Slocum to Meade, December 30, 1863 and Meade to Slocum, February 25, 1864
^Kane returned to the army at Gettysburg on July 2, but he had to share command with Cobham on account of sickness [9]
^Unassigned during progress of battle; afterward attached to First Division, as Second Brigade. The command theretofore known as the Second Brigade had previously been consolidated with the First Brigade
U.S. War Department, The War of the Rebellion: a Compilation of the Official Records of the Union and Confederate Armies. Washington, DC: U.S. Government Printing Office, 1880–1901.
