Organization of the Federal Army of the Potomac during the Civil War Battle of Gettysburg, July 1-3, 1863.

Army of the Potomac (monument)
Major General George G. Meade (monument)
strength: 93,700 men, 372 guns
casualties: 3,150 killed, 14,500 wounded, 5,150 missing, 22,800 total

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1st Corps (monument) Major General John Reynolds (killed July 1) (monument) Major General Abner Doubleday (relieved July 2) (monument) Major General John Newton strength: 12,220 men, 28 guns casualties: 665 killed, 3,230 wounded, 2,160 missing, 6,055 total 2nd Corps (monument) Major General Winfield S. Hancock (wounded July 3) (monument) Brigadier General John Gibbon (wounded July 3) (monument) Brigadier General William Hays strength: 11,350 men, 28 guns casualties: 795 killed, 3,195 wounded, 380 missing, 4,370 total 3rd Corps (monument) Major General Daniel E. Sickles (wounded July 2) (monument) Major General David Birney  strength: 13,000 men, 30 guns casualties: 590 killed, 3,030 wounded, 590 missing, 4,210 total 5th Corps (monument) Major General George Sykes strength: 10,900 men, 26 guns casualties: 365 killed, 1,610 wounded, 210 missing, 2,185 total 6th Corps (monument) Major General John Sedgwick (monument) strength: 13,600 men, 48 guns casualties: 27 killed, 185 wounded, 30 missing, 242 total 11th Corps (monument) Major General Oliver O. Howard (monument) Major General Adolph Von Steinwehr strength: 9,190 men, 26 guns casualties: 370 killed, 1,920 wounded, 1,510 missing, 3,800 total 12th Corps (monument) Major General Henry Slocum (monument) strength: 10,700 men, 20 guns casualties: 205 killed, 810 wounded, 65 missing, 1,080 total

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Artillery Reserve (monument)
Brigadier General Robert O. Tyler 
strength: 2,375 men, 114 guns
casualties: 43 killed, 187 wounded, 12 missing, 242 total

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Cavalry Corps (monument)
Major General Alfred Pleasonton
strength: 11,850 men, 52 guns
casualties: 85 killed, 325 wounded, 200 missing, 610 total

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Provost Guard
Brigadier General Marsena R. Patrick
engaged strength: 1,750
casualties: 1 killed, 4 wounded

93rd New York Infantry (monument)
Colonel John S. Crocker

8th United States Infantry (monument)
Captain Edwin W.H. Read

2nd Pennsylvania Cavalry (monument)
Colonel Richard B. Price

6th Pennsylvania Cavalry, Company E (monument)
Captain Emlen N. Carpenter

6th Pennsylvania Cavalry, Company I (monument)
Captain James Starr

Oneida (New York) Cavalry (monument)
Captain Daniel P. Mann

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Engineer Brigade (monument)
Brigadier General Henry W. Benham
Not present at Gettysburg; maintaining pontoon bridges across the Potomac

15th New York engineers, 3 companies (monument)
Major Walter L. Cassin

50th New York Engineers (monument)
Colonel William H. Pettis

United States Engineer Battalion (monument)
Captain George H. Mendell

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Escort
1st Pennsylvania Cavalry Regiment (monument)
Colonel John P. Taylor

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Staff
Major General Daniel, Butterfield Chief of Staff (wounded July 3)
Brigadier General Gouverneur K. Warren, Chief of Engineers (wounded July 2) (monument)
Brigadier General Seth Williams, Assistant Adjutant General
Brigadier General Rufus Ingalls, Quartermaster
Brigadier General Henry J. Hunt, Chief of Artillery (monument)
Colonel George H. Sharpe, Bureau of Information
Major Jonathan Letterman, Medical Director