4th U.S. Artillery, Battery A

• Consolidated with Battery C, 4th U.S. Light Artillery from October 1861 until October 18, 1862. • Sumner's Division, Army of the Potomac, to March 1862. • Artillery, 1st Division, II Corps, Army of the Potomac, to November 1862. • Reserve Artillery, II Corps, to May 1863. • Artillery Brigade, II Corps, to July 1863. • 1st Brigade, Horse Artillery, Army of the Potomac, to June 1864. • 1st Brigade, Hardin's Division, XXII Corps, to July 1864. • Camp Barry, Defenses of Washington, D.C., XXII Corps, to August 1865. ==Detailed service==

• Duty in the defenses of Washington, D.C., until March 1862. Moved to the Virginia Peninsula. • Siege of Yorktown April 5–May 4. • Battle of Seven Pines, Fair Oaks, May 31–June 1. • Seven Days Battles before Richmond June 25–July 1. • Peach Orchard and Savage Station June 29. • White Oak Swamp and Glendale June 30. • Malvern Hill July 1. • At Harrison's Landing until August 16. • Moved to Alexandria and Centreville August 16–28. • Covered Pope's retreat August 28–September 2. • Maryland Campaign September 6–22. • Battle of Antietam September 16–17. • At Harpers Ferry September 22–October 30. Received 70 men who transferred from the 4th Ohio Infantry and refitted at Washington, D.C. before rejoining II Corps. • Movement to Falmouth, Va., October 30–November 19. • Battle of Fredericksburg December 12–15. • At Falmouth, Va., until April 1863. • Chancellorsville Campaign April 27–May 6. • Battle of Chancellorsville May 1–5. • Gettysburg Campaign June 11-July 16. • Battle of Gettysburg July 1–3. • Made a horse battery July 15, and attached to 1st Division, Cavalry Corps, Army of the Potomac. • Advanced 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. • Parker's Store November 29. • Rapidan Campaign May 4–June 4, 1864. • Battle of the Wilderness May 5–7. • Sheridan's Raid to the James River May 9–24. • North Anna River May 9. • Ground Squirrel Church and Yellow Tavern May 11. • Brook Church, Fortifications of Richmond, May 12. • On line of the Pamunkey May 26–28. • Totopotomoy May 28–31. • Cold Harbor May 31–June 1. • Dismounted and sent to Washington, D.C., June 4. • Duty in the defenses of Washington, D.C., until August 1865. ==Commanders==

• Captain George Washington Hazzard - mortally wounded at the Battle of White Oak Swamp • Brevet Captain Rufus King, Jr. - commanded at the Battle of White Oak Swamp while still at the rank of 1st lieutenant after Cpt Hazzard was mortally wounded • Lieutenant Alonzo H. Cushing- commanded at the Battle of Gettysburg; killed in action • 1st Lieutenant Evan Thomas • 1st Lieutenant Horatio B. Reed • 2nd Lieutenant Samuel Canby - commanded at the Battle of Gettysburg after Lt Cushing was wounded and until he was wounded in action • 2nd Lieutenant Joseph S. Milne - commanded at the Battle of Gettysburg after Lt Canby was wounded and until he was wounded in action • 1st Sergeant Frederick Füger - commanded at the Battle of Gettysburg after all officers were killed or wounded in action ==Notable members==

• Lieutenant Alonzo Cushing - Medal of Honor recipient for action at the Battle of Gettysburg • 1st Sergeant Frederick W. Füger - Medal of Honor recipient for action at the Battle of Gettysburg • Captain Rufus King Jr. - Medal of Honor recipient for action at the Battle of White Oak Swamp ==See also==