4th United States Artillery / Battery A

== Regimental History and Service Record ==
Consolidated with Battery "C" at Washington, D.C., October, 1861. Attached to Sumner's Division, Army of the Potomac, to March, 1862. Artillery, 1st Division, 2nd Army Corps, Army of the Potomac, to November, 1862. (Batteries separated October 18, 1862.) Reserve Artillery, 2nd Army Corps, to May, 1863. Artillery Brigade, 2nd Army Corps, to July, 1863. 1st Brigade, Horse Artillery, Army of the Potomac, to June, 1864. 1st Brigade, Hardin's Division, 22nd Army Corps, to July, 1864. Camp Barry, Defenses of Washington, D. C., 22nd Corps, to August, 1865.
SERVICE.--Duty in the Defenses of Washington, D.C., until March, 1862. 
* Moved to the Virginia Peninsula. 
* March 17-September 2, 1862 - The Peninsula Campaign 
** April 5-May 4, 1862 - Siege of Yorktown, Virginia
** May 31-June 1, 1862 - Battle of Seven Pines, Virginia 
** June 25-July 1, 1862 - The Seven Days Battles before Richmond, Virginia
*** June 29, 1862 - Battle of the Peach Orchard, Virginia
*** June 29, 1862 - Engagement at Savage's Station, Virginia
*** June 30, 1862 - Engagement at White Oak Swamp, Virginia
*** June 30, 1862 - Engagement at Glendale, Virginia
*** July 1, 1862 - Engagement at Malvern Hill, Virginia
At Harrison's Landing until August 16. Movement to Alexandria and Centreville August 16-28. Cover Pope's retreat August 28-September 2. 
* September 3-20, 1862 - The Maryland Campaign
** September 17, 1862 - Battle of Antietam, Maryland
At Harper's Ferry September 22-October 30. Movement to Falmouth, Va., October 30-November 19. Battle of Fredericksburg December 12-15. At Falmouth, Va., until April, 1863. 
* April 27-May 6, 1863 - The Chancellorsville Campaign
** May 1-5, 1863 - Battle of Chancellorsville, Virginia
* June 11-August 1, 1863 - The Gettysburg Campaign
** July 1-3, 1863 - Battle of Gettysburg, Pennsylvania
Made a Horse Battery July 15, and attached to 1st Division, Cavalry Corps, Army of the Potomac. Advance to the Rapidan September 13-17. Culpeper Court House September 13. Reconnaissance across the Rapidan September 21-23. Bristoe Campaign October 9-22. White Sulphur Springs October 12. Bristoe Station October 14. St. Stephen's Church October 14. Advance to line of the Rappahannock November 7-8. 
Mine Run Campaign November 26-December 2. 
* November 29, 1863 - Action at Parker's Store, Virginia
* May 4-June 12, 1864 - The Overland Campaign
** May 5-7, 1864 - Battle of the Wilderness, Virginia
** May 9-24, 1864 - (Sheridan's) Expedition from Todd's Tavern to the James River, Virginia
*** May 10, 1864 - Engagement on the North Anna River, Virginia
*** May 11, 1864 - Engagement at Yellow Tavern, Virginia
*** May 12, 1864 - Engagement at Brook's Church, Virginia
** May 26-28, 1864 - Operations on Line of the Pamunkey River, Virginia
** May 28-31, 1864 - Operations on Line of the Totopotomoy River, Virginia
** May 31-June 1, 1864 - Battles of Cold Harbor, Virginia
* June 4, 1864 - Dismounted and sent to Washington, D.C.
* Duty in the Defenses of Washington, D.C., until August, 1865.
== Regimental Roster ==
== Regiment Statistical Information ==
Source 	Casualties 	Remarks
Dyer 	None listed	None
Fox 	None listed	
* Fox lists this unit as 7th on the list of units "sustaining greatest loss in action" (Regular Army Light Artillery Companies) but offers no specific numbers for these commands
WotRWiki Statistics	
* troops killed
** Includes troops mortally wounded
** Includes troops killed by disease
** All others are troops killed in action or under special circumstances	
== Legacy ==
== Notes ==
== Sources == 
* (Pages 761, 828, 897, 901, 902, 903, 904, 905, 916, 932, 933, 935, 936, 937, 939, 940, 941, 1703)
* (Page 7)
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