Dyer's Compendium 
(Union) Eastern Departments and Armies

      Department of Pennsylvania

 

      Constituted April 27, 1861, to consist of Pennsylvania, Delaware, and all

      of Maryland, not embraced in the Departments of Annapolis and Washington.

      Merged Into the Department of the Potomac Aug. 24, 1861.

      Commander:

      Robert Patterson Major General April 27, 1861, to Aug. 24, 1861

      

      Department of Northeastern Virginia

      Created May 28, 1861. Merged into Department of the Potomac Aug. 17, 1861

      Commander:

      Irvin McDowell, Brigadier General

      

      Department of the Shenandoah

      Constituted July 19, 1861 to consist of the Valley of Virginia, the

      Counties of Washington and Allegheny in Maryland, and such parts of

      Virginia as may be covered by the army in its operations. Discontinued

      Aug. 17, 1861, and merged into the Department of the Potomac.

      Commander:

      N. P. Banks Major General July 25, 1861 to Aug. 17, 1861

      

      Department of the Potomac (also known as the Army of the Potomac)

      Created July 25, 1861, by the consolidation of the Department of

      Washington, and the Department of Northeastern Virginia. Discontinued June

      28, 1865.

      Commanders:

      Geo. B. McClellan Major General Aug. 20, 1861, to Nov. 9, 1862.

      A. E. Burnside Major General Nov. 9, 1862, to January. 26, 1863.

      Jos. Hooker Major General January. 26, 1863, to June 28, 1863.

      Geo. G. Meade Major General June 28, 1863, to Dec. 30, 1864.

      John G. Parke Major General Dec. 30, 1864, to January 11, 1865.

      Geo. G. Meade Major General January 11, 1865, to June 28, 1865.

      

      Army of the Potomac (as organized into Divisions Oct., 1861, to March,

      1862)

      Bank's Division - Organized Aug. 17, 1861, by transfer from Dept. of the

      Shenandoah to Dept. of the Potomac.

      Commander:

      N. P. Banks Major General Aug. 17, 1861, to March 13, 1862

      

      First Army Corps

      Created March 3, 1862. Announced March 13, 1862. Discontinued April 4,

      1862, and merged into the Department of the Rappahannock.

      Commander:

      Irvin McDowell Major General March 13, 1862, to April 4, 1862

      

      First Army Corps

      Re-Created Sept 12, 1862, From 3d Army Corps, Army of Virginia,

      Discontinued March 24, 1864, and merged into the 5th Army Corps, Army of

      the Potomac.

      Commanders:

      Joseph Hooker Major General Sept. 12, 1862, to Sept 17, 1862.

      George G. Meade Brigadier General Sept. 17, 1862, to Sept 29 1862.

      J. F. Reynolds Brigadier General Sept. 29. 1862, to Jan. 2, 1863.

      J. S Wadsworth Brigadier General Jan. 2, 1863, to Jan. 4, 1863.

      J. F. Reynolds Major General Jan. 4, 1863, to March 19, 1863.

      J. S. Wadsworth Brigadier General March 1, 1863, to March 9, 1863.

      J. F. Reynolds Major General March 9, 1863. to July 1, 1863. Killed.

      A. Doubleday Major General. July 1, 1863, to July 2, 1863.

      John Newton Major General July 2, 1863, to March 24, 1864.

      

      Second Army Corps

      Created March 3, 1862, by the President of the United States. Announced

      March 13, 1862, in General Order No. 101, Army of the Potomac.

      Discontinued June 28, 1865.

 

      Commanders:.

      E. V. Sumner Major General March 13, 1862, to Oct. 7, 1862.

      D. N. Couch Major General Oct. 7, 1862, to Dec. 26, 1862.

      John Sedgwick Major General Dec. 26. 1862, to Jan. 26, 1863.

      O. O. Howard Major General Jan. 26, 1863, to Feb. 5, 1863.

      D. N. Couch Major General Feb. 5, 1863, to May 22, 1863.

      W. S. Hancock Major General May, 22, 1863, to July 1, 1863.

      John Gibbon Brigadier General July 1, 1863, to July 2, 1863.

      W. S Hancock Major General July 2, 1863, to July 3, 1863.

      Wm. Hays Brigadier General July 3, 1863, to Aug. 16, 1863.

      G. K. Warren Major General Aug. 16, 1863, to Aug. 26, 1863.

      J. C. Caldwell Brigadier General Aug. 26, 1863, to Sept. 2, 1863.

      G. K. Warren Major General Sept. 2, 1863, to Dec. 16, 863.

      J. C. Caldwell Brigadier General Dec. 16, 1863, to Dec. 29, 1863.

      G. K. Warren Major General Dec. 29, 1863, to Jan. 9, 1864.

      J. C. Caldwell Brigadier General Jan. 9, 1864, to Jan. 15, 1864

      G. K. Warren Major General Jan. 15, 1864 , to March 24, 1864.

      W. S. Hancock Major General March 24, 1864, to June 18, 1864.

      D. B. Birney Major General June 18, 1864, to June 27, 1864.

      W. S. Hancock Major General June 27, 1864, to Nov. 26, 1864.

      A. A. Humphreys Major General Nov. 26, 1864, to Feb. 15, 1865.

      Gershom Mott Bvt. Major General Feb.15,1865, to Feb. 17,1865.

      N. A. Miles Bvt. Major General Feb. 17, 1865, to Feb. 25, 1865.

      A. A. Humphreys Major General Feb. 26, 1865, to Apr. 22, 1865.

      F. C. Barlow Bvt. Major General Apr. 22, 1865, to May 5, 1865.

      A. A. Humphreys Major General May, 5, 1865, to June 9, 1865.

      Gershom Mott Bvt. Major General June 9, 1865, to June 20, 1865.

      A. A. Humphreys Major General June 20, 1865, to June 28, 1865.

      

      Third Army Corps

      Created March 3, 1862, by order of the President of the U.S. Announced

      March 13, 1862, in General Order No. 101, Army of the Potomac. Broken up

      and discontinued March 24, 1864.

      Commanders:

      S. P. Heintzelman Brigadier General March 13, 1862, to Oct. 30, 1862.

      Geo. Stoneman Brigadier General Oct. 30, 1862, to Feb. 5, 1863.

      D. E. Sickles Major General Feb. 5, 1863, to May 29, 1863.

      D. B. Birney Major General May 29, 1863, to June 3, 1863.

      D. E. Sickles Major General June 3, 1863, to July 2, 1863.

      D. B. Birney Major General July 2, 1863, to July 7, 1863.

      W. H. French Major General July 7, 1863, to Jan. 28, 1864.

      D. B. Birney Major General Jan. 28, 1864, to Feb. 17, 1864.

      W. H. French Major General Feb. 17, 1864, to March 24, 1864.

      

      Fourth Army Corps

      Created March 3, 1862, by order of the President of the U.S. Announced

      March 13, 1862, in G. O. No. 101, the Potomac. Discontinued Aug. 1, 1863.

      Commanders:

      E. D. Keyes Brigadier General March 13, 1862, to Aug. 1, 1863.

      

      Fifth Army Corps

      Created March 3, 1862, by order of the President of the U.S. Announced

      March 13, 1862, in General Order No. 101 Army Potomac. Discontinued April

      4, 1862, and merged into the Department of the Shenandoah.

      Commander:

      N. P. Banks Major General March 13, 1862, to Apr. 4, 1862.

      

      Fifth Army Corps

      Re-Created and organized provisionally May 18, 1862. Confirmed by War

      Department, 1862. Discontinued June 28, 1865.

      Commanders:

      Fitz John Porter Brigadier General May 18, 1862, to Nov. 10, 1862.

      Joseph Hooker Major General Nov. 10, 1862, to Nov. 16, 1862.

      D. Butterfield Brigadier General Nov. 16, 1862, to Dec. 25, 1862.

      Geo. Meade Major General Dec. 25, 1862, to Jan. 26, 1863.

      Charles Griffin Brigadier General Jan. 26, 1863, to Feb. 1, 1863.

      George Sykes Major General Feb. 1, 1863, to Feb. 5, 1863.

      Geo. Meade Major General Feb. 5. 1863, to Feb. 16, 1863.

      Geo. Sykes Major General Feb. 18, 1863, to Feb. 23, 1863.

      A. A. Humphreys Major General Feb. 23, 1863, to Feb. 28, 1863.

      Geo. Meade. Major General Feb. 28. 1863. to June 28, 1863.

      Geo. Sykes Major General June 28, 1863, to Oct. 7, 1863.

      S. W. Crawford Brigadier General Oct. 7, 1863, to Oct. 15, 1863.

      Geo. Sykes Major General Oct. 15, 1863, to March 23, 1864.

      G. K. Warren Major General March 23, 1864, to Jan. 2, 1865.

      S. W. Crawford Bvt. Major General Jan. 2, 1865, to Jan. 27, 1865.

      G. K. Warren Major General Jan. 27, 1865, to Apr. 1, 1865.

      Chas. Griffin Major General Apr. 1. 1865, to June 28, 1865.

      

      Sixth Army Corps

      Created and organized provisionally May 18, 1862. General Order No. 125,

      Army of the Potomac. Confirmed by War Department July 22, 1862.

      Transferred to Army of the Shenandoah, Middle Military Division, July,

      1864. Rejoined Army of the Potomac Dec. 6, 1864. Discontinued June 28,

      1865.

      Commanders:

      Wm. B. Franklin Major General May 18, 1862, to Nov. 16, 1862.

      W. F. Smith Major General Nov. 16, 1862, to Feb. 4, 1863.

      John Sedgwick Major General Feb. 4, 1863, to Apr. 6, 1864.

      J. B. Ricketts Brigadier General Apr. 6, 1864, to Apr. 13, 1864.

      John Sedgwick Major General Apr. 13, 1864, to May 9, 1864. Killed.

      H. G. Wright Major General May 9, 1864, to July 8, 1864.

      

      Transferred to the Army of the Shenandoah to Dec. 1864 - Rejoined AOP Dec.

      6, 1864.

      

      H. G. Wright Major General Dec. 6, 1864, to Jan. 16, 1865.

      Geo. W. Getty Bvt. Major General Jan. 16, 1865, to Feb. 11, 1865.

      H. G. Wright Major General Feb. 11, 1865, to June 28, 1865.

      

      Ninth Army Corps

      Created July 22, 1862, and organized by transfer of troops from the

      Department of North Carolina and from the Department of the South. Corps

      transferred to the Department of the Ohio March 19, 1863. Rejoined Army of

      the Potomac April, 1864. Transferred to the Department of Washington June,

      1865, and discontinued Aug. 1, 1865.

      Commanders:

      A. E. Burnside Major General July 22, 1862, to Sept. 3, 1862.

      J. L. Reno Major General Sept. 3, 1862, to Sept. 14, 1862. Killed.

      J. D. Cox Brigadier General Sept. 14, 1862, to Oct. 8, 1862.

      O. B. Willcox Brigadier General Oct. 8, 1862, to Jan. 16, 1863.

      John Sedgwick Major General Jan. 16, 1863, to Feb. 5, 1863.

      W. F. Smith Major General Feb. 5. 1863, to March 17, 1863.

      A. E. Burnside Major General March 17, 1863, to March 19, 1863.

      J. G. Parke Major General March 19, 1863, to Apr. 4, 1863.

 

      Transferred to the Department of the Ohio March 19, 1863. Rejoined Army of

      the Potomac April, 1864.

      A. E. Burnside Major General Apr. 13, 1864, to Aug. 14, 1864.

      J. G. Parke Major General Aug. 14, 1864, to Dec. 31, 1864.

      O. B. Willcox Brigadier General Dec. 31, 1864, to Jan. 12, 1865.

      J. G. Parke Major General Jan. 12, 1865, to Jan. 24, 1865.

      O. B. Willcox Bvt. Major General Jan. 24. 1865, to Feb. 2, 1865.

      J. G. Parke Major General Feb. 2, 1865, to June 17, 1865.

      O. B. Willcox Bvt. Major General June 17, 1865, to July 2, 1865.

      J. G. Parke Major General July 2, 1865, to Aug. 1, 1865.

      

      Eleventh Army Corps

      Created Sept. 12, 1862, General Order No. 129, A. G. O., From 1st Corps,

      Army of Virginia. Transferred to Department of the Cumberland Sept. 25,

      1863.

 

      Commanders:

      Franz Sigel Major General Sept. 12, 1862, to Jan. 10, 1863.

      J. H. Stahel Brigadier General Jan. 10, 1863, to Jan. 19, 1863.

      Carl Schurz Major General Jan. 19, 1863, to Feb. 5, 1863.

      Franz Sigel Major General Feb. 5, 1863, to Feb. 22, 1863.

      A. Von Steinwehr Brigadier General Feb. 22, 1863, to March 5, 1863.

      Carl Schurz Major General March 5, 1863, to Apr. 2, 1863.

      O. O. Howard Major General Apr. 2, 1863, to Sept. 25, 1863.

      Carl Schurz Major General Temporarily on July 1, 1863.

      

      Twelfth Army Corps

      Created Sept. 12, 1862, by General Order No. 129, A. G. O., >From the 2d

      Corps, Army of Virginia. Transferred to the Department of the Cumberland

      Sept. 25, 1863.

      Commander:

      J. F. K. Mansfield Major General Sept. 12, 1862, to Sept. 17, 1862.

Killed.

      A. S. Williams Brigadier General Sept. 17, 1862, to Oct. 20, 1862.

      H. W. Slocum Major General Oct. 20, 1862, to July 1. 1863.

      A. S. Williams Brigadier General July 1, 1863, to July 4, 1863.

      H. W. Slocum Major General July 4, 1863, to Aug. 31, 1863.

      A. S. Williams Brigadier General Aug. 31, 1863, to Sept. 13, 1863.

      H. W. Slocum Major General Sept. 13, 1863, to Sept. 25, 1863.

      

      Cavalry Division, Army of the Potomac

      As organized July, 1862

      Commander:

      George Stoneman Brigadier General

      

      Cavalry Corps

      Created and organized February, 1863.  Broken up May, 1865.

      Commanders:

      Geo. Stoneman Major General Feb. 12, 1863, to May 22, 1863.

      A. Pleasanton Brigadier General May 22, 1863, to Jan. 22, 1864.

      D. McMurtrie Gregg Brigadier General Jan. 22, 1864, to Feb. 12, 1864.

      A. Pleasanton Brigadier General Feb. 12, 1864, to March 25, 1864.

      D. McMurtrie Gregg Brigadier General March 25, 1864, to Apr. 4, 1864.

      P. H. Sheridan Major General Apr. 4, 1864, to Aug. 2, 1864.

 

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