Here are all of the Army Corps and Division-size units and their commanders who participated in the Maryland Campaign of 1862.

Federal units are listed by Corps and Division number, Confederates by Commanders' names. Each unit name is a link to more information about it and to the subsidiary units which made it up. Officers' names are links to brief biographical information and (sometimes) pictures of them.

Note that in some cases more than one officer is listed for a unit. This occurs when the original (first listed) commander was killed, wounded, relieved, or moved to another command and was replaced by the next named officer.

For a different view, in the form of an interactive tree diagram down to the battery and regiment levels, click on one of the tree diagram images below the names of the Generals Commanding.

Federal

Major General George B. McClellan, USA, commanding

Confederate

General Robert E. Lee, CSA, commanding

(MGen. Joseph Hooker) (BGen. George G. Meade)

First Division - (BGen. John P. Hatch) (BGen. Abner Doubleday)
Second Division - (BGen. James B. Ricketts)
Third Division - (BGen. George G. Meade) (BGen. Truman Seymour)

(MGen. Edwin V. Sumner)

First Division - (MGen. Israel B. Richardson) (BGen. John C. Caldwell) (BGen. Winfield S. Hancock)
Second Division - (MGen. John Sedgwick) (BGen. Oliver O. Howard)
Third Division - (BGen. William H. French)
Unattached Corps Artillery

(MGen. Fitz John Porter)

x First Division - (MGen. George W. Morell)
Second Division - (BGen. George Sykes)
x Third Division - (BGen. Andrew A. Humphreys)
Corps Artillery Reserve - (LCol. William Hays)

(MGen. William B. Franklin)

First Division - (MGen. Henry W. Slocum)
Second Division - (MGen. William F. Smith)
x First Division, Fourth Corps (attached) - (MGen. Darius N. Couch)

(MGen. Jesse L. Reno) (MGen. Ambrose E. Burnside) (BGen. Jacob D. Cox)

First Division - (BGen. Orlando B. Willcox)
Second Division - (BGen. Samuel D. Sturgis)
Third Division - (BGen. Isaac P. Rodman) (Col. Edward Harland)
Kanawha Division - (BGen. Jacob D. Cox) (Col. Eliakim P. Scammon)
Unattached Corps Artillery/Cavalry

(MGen. Joseph K. F. Mansfield) (BGen. Alpheus S. Williams)

First Division - (BGen. Alpheus S. Williams) (BGen. Samuel W. Crawford) (BGen. George H. Gordon)
Second Division - (BGen. George S. Greene)
Corps Artillery - (Capt. Clermont L. Best)

CAVALRY DIVISION (BGen. Alfred Pleasonton)

x - Unit not present and/or not engaged at Antietam on 17 September.

Federal

(MGen. John E. Wool)

Harpers Ferry Garrison - (Col. Dixon S. Miles) (BGen. Julius White)
Pennsylvania Militia of 1862 - (BGen. John F. Reynolds)
145th Pennsylvania Infantry - (Col. Hiram L. Brown, Jr.)

(MGen. James Longstreet)

McLaws' Division - (MGen. Lafayette McLaws)
Anderson's Division - (MGen. Richard H. Anderson) (BGen. Roger A. Pryor)
Jones's Division - (BGen. David R. Jones)
Walker's Division - (BGen. John G. Walker)
Hood's Division - (MGen. John B. Hood)
Evans' (Independent) Brigade - (BGen. Nathan G. Evans) (Col. P.F. Stevens)
Longstreet's Corps Artillery - (Col J. B. Walton)

(MGen. Thomas J. "Stonewall" Jackson)

Ewell's Division - (BGen. Alexander R. Lawton) (BGen. Jubal A. Early)
A. P. Hill's Light Division - (MGen. Ambrose P. Hill)
Jackson's Division - (BGen. John R. Jones) (BGen. William E. Starke) (Col. Arnold J. Grigsby)
D. H. Hill's Division - (MGen. Daniel H. Hill)
Jackson's Reserve Artillery - (Col S. Crutchfield)

CAVALRY DIVISION (MGen. James E. B. Stuart)

Abbreviations:
Capt = Captain
LCol = Lieutenant Colonel
Col = Colonel
BGen = Brigadier General
MGen = Major General