21st Georgia Infantry

== Regimental History and Service Record ==
* September 27, 1861 - Organized by increase of 4th (Mercer's) Georgia Infantry Battalion to a regiment
** ? - Mustered into Confederate Service at the Fairgrounds, Richmond, Virginia 
* May 8, 1862 - McDowell
* May 8, 1862 - (I) Company E reorganized as Smith's Legion (Georgia) Infantry Battalion / Company G per Adjutant and Inspector General's Office / Special Order #106
* May-June 1862 - Shenandoah Valley Campaign
* May 25, 1862 - 1st Winchester
* June 8-9, 1862 - Cross Keys
* June 25-July 1, 1862 - The Seven Days Battles before Richmond, Virginia
* June 27, 1862 - Gaines' Mill 
* July 1, 1862 - Malvern Hill
* August 9, 1862 - Cedar Mountain
* August 26-27, 1862 - Bristoe and Manassas Junction
* August 28-30, 1862 - 2nd Bull Run
* September 1, 1862 - Chantilly
* September 17, 1862 - Battle of Antietam, Maryland
* December 13, 1862 - Fredericksburg
* May 1-4, 1863 - Battle of Chancellorsville, Virginia
* July 1-3, 1863 - Battle of Gettysburg, Pennsylvania
* October 1863 - Bristoe Campaign
* November-December 1863 - Mine Run Campaign
* January-February 1864 - New Bern Expedition
* April 11, 1864 - 2nd North Carolina Infantry Battalion / Company D reorganized as 2nd CompanyIs this supposed to be (II) Company E? Not specified per Adjutant and Inspector General's Office / Special Order #84
* May 8-21, 1864 - Battles of Spotsylvania Court House, Virginia
* May 22-26, 1864 - North Anna River
* June 1-3, 1864 - Cold Harbor
* July 9, 1864 - Monocacy
* September 19, 1864 - 3rd Winchester
* September 22, 1864 - Fisher's Hill
* October 19, 1864 - Cedar Creek
* June 1864-April 1865 - Siege of Petersburg (from December)
* March 25, 1865 - Fort Stedman
* April 9, 1865 - Appomattox Court House
** Surrendered
DESIGNATIONS
* Army of the Potomac / 1st Corps / Crittenden's Brigade (September-November 1861)
* Department of Northern Virginia / Potomac District / E.K. Smith's Division / Crittenden's/Trimble's Brigade (November 1861-January 1862)
* Department of Northern Virginia / Potomac District / E.K. Smith's/Ewell's Division / Trimble's Brigade (January-March 1862)
* Department of Northern Virginia / Ewell's Division / Trimble's Brigade (March-May 1862)
* Department of Northern Virginia / Valley District / Ewell's Division / Trimble's Brigade (May-June 1862)
* Army of Northern Virginia / 2nd Corps / Ewell's Division / Trimble's Brigade (June 1862-January 1863)
* Army of Northern Virginia / 2nd Corps / D.H. Hill's Division / Ripley's/Doles' Brigade (January 1863-January 1864)
* Department of North Carolina / Hoke's Brigade (January-March 1864)
* Army of Northern Virginia / 2nd Corps / Rodes' Division / Doles'/Cook's Brigade (May-June 1864)
* Army of Northern Virginia / Valley District / Rodes'/Grimes' Division / Cook's Brigade (June-December 1864)
* Army of Northern Virginia / 2nd Corps / Grimes' Division / Cook's Brigade (December 1864-April 1865)
== Regimental Roster ==
* First Commander: John T. Mercer (Colonel)
* Thomas C. Glover (Major, Lieutenant Colonel)
* Thomas W. Hooper (Major, Lieutenant Colonel, Colonel)
* Michael Lynch (Major)
* James J. Morrison (Lieutenant Colonel)
== Regiment Statistical Information ==
== Legacy ==
== Notes ==
== Sources == 
* Nisbet, James C., Four Years on the Firing Line
* (Pages 188, 224-225)
* Thomas, Henry W., A History of the Doles-Cook Brigade, Army of Northern Virginia
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