First Corps, commanded by Maj. Gen. John F. Reynolds, with divisions commanded by Brig. Gen. James S. Wadsworth, Brig. Gen. John C. Robinson, and Maj. Gen. Abner Doubleday.
Second Corps, commanded by Maj. Gen. Winfield S. Hancock, with divisions commanded by Brig. Gens. John C. Caldwell, John Gibbon, and Alexander Hays.
Third Corps, commanded by Maj. Gen. Daniel E. Sickles, with divisions commanded by Maj. Gen. David B. Birney and Maj. Gen. Andrew A. Humphreys.
Fifth Corps, commanded by Maj. Gen. George Sykes (George G. Meade until June 28. 1863), with divisions commanded by Brig. Gens. James Barnes, Romeyn B. Ayres, and Samuel W. Crawford.
Sixth Corps, commanded by Maj. Gen. John Sedgwick, with divisions commanded by Brig. Gen. Horatio G. Wright, Brig. Gen. Albion P. Howe, and Maj. Gen. John Newton.
Eleventh Corps, commanded by Maj. Gen. Oliver O. Howard, with divisions commanded by Brig. Gen. Francis C. Barlow, Brig. Gen. Adolph von Steinwehr, and Maj. Gen. Carl Schurz.
Twelfth Corps, commanded by Maj. Gen. Henry W. Slocum, with divisions commanded by Brig. Gens. Alpheus S. Williams and John W. Geary.
Cavalry Corps, commanded by Maj. Gen. Alfred Pleasonton, with divisions commanded by Brig. Gens. John Buford, David McMurtrie Gregg, and H. Judson Kilpatrick.
Artillery Reserve, commanded by Brig. Gen. Robert O. Tyler. (The preeminent artillery officer at Gettysburg was Brig. Gen. Henry J. Hunt, chief of artillery on Meade’s staff.)
Union Casualties at Gettysburg:
Killed: 3,155
Wounded: 14,531
Missing: 5,369
Total: 23,055
(from Regimental Strengths and Losses at Gettysburg by John W. Busey and David G. Martin.)
First Corps, commanded by Lt. Gen. James Longstreet, with divisions commanded by Maj. Gens. Lafayette McLaws, George E. Pickett, and John Bell Hood.
Second Corps, commanded by Lt. Gen. Richard S. Ewell, with divisions commanded by Maj. Gens. Jubal A. Early, Edward “Allegheny” Johnson, and Robert E. Rodes.
Third Corps, commanded by Lt. Gen. A. P. Hill, with divisions commanded by Maj. Gens. Richard H. Anderson, Henry Heth, and W. Dorsey Pender.
Cavalry division, commanded by Maj. Gen. J. E. B. Stuart, with brigades commanded by Brig. Gens. Wade Hampton, Fitzhugh Lee, Beverly H. Robertson, Albert G. Jenkins, William E. “Grumble” Jones, and John D. Imboden, and Col. John R. Chambliss.
Confederate Casualties at Gettysburg:
Killed: 4,708
Wounded: 12,693
Missing: 5,830
Total: 23,231