Battery L is honored by two monuments at Gettysburg shared with Battery B.

1861
January At Fortress Monroe, Va.
May Attached to the newly-created Department of Virginia
September Ordered to Washington, D.C., and attached to Artillery Reserve, Army of the Potomac
1862
March Ordered to the Virginia Peninsula.
April to August Peninsula Campaign
May Consolidated with Battery B, 2nd United States Artillery and attached to 1st Brigade, Horse Artillery, Artillery Reserve, 5th Army Corps, Army of the Potomac
June 25-July 1 Seven days before Richmond
June 30 Turkey Bridge
July 1 Malvern Hill
July-August At Harrison’s Landing
August 16-24 Moved to Fortress Monroe, then to Alexandria
September 7-22 Maryland Campaign. Attached to Artillery, Pleasanton’s Cavalry Division, Army of the Potomac
September 10-11 Sugar Loaf Mountain
September 12 Frederick
September 13 Catoctin Mountain
September 16-17
Battle of Antietam
September 19 Shepherdstown Ford
November Attached to Averill’s Cavalry Brigade, Right Grand Division, Army of the Potomac
November 4 Markham Station
November 6 Warrenton
December 12-15
Battle of Fredericksburg
1863
February Attached to 1st Division, Cavalry Corps, Army of the Potomac
April 27-May 8 Chancellorsville Campaign
April 29-May 6 Stoneman’s Raid
June 9 Brandy Station or Fleetwood and Beverly Ford
June Attached to 1st Brigade, Horse Artillery, Army of the Potomac
July 1-3
Battle of Gettysburg

The combined batteries were commanded by Lieutenant Edward Heaton, and brought 6 3-inch rifles to the field.

From the monument at Gettysburg:

July 2. Arrived near the battlefield at 5:30 a.m. and reported to Major General Alfred Pleasonton who ordered the Battery be held in reserve until near dark when it was moved back two miles on the Baltimore Pike for the night.

July 3. Moved to the front and was ordered to the position occupied the day before but being subject to the severe artillery fire the Battery was ordered to retire out of range and there remained until the close of battle.

August 1-4 Brandy Station
September 13-17 Advance from the Rappahannock to the Rapidan
October 9-22 Bristoe Campaign
October 10 Raccoon Ford
October 11 Morton’s Ford, Stevensburg, and Kelly’s Ford
October 11-12 Brandy Station or Fleetwood
October 15 Oak Hill
November 7-8 Advance to line of the Rappahannock
November 26-December 2 Mine Run Campaign
November 27 New Hope Church
1864
May 4-June 12 Rapidan Campaign
May 5-7
Battle of the Wilderness
May 6 Brock Road and the Furnaces
May 7-8 Todd’s Tavern
May 9-24 Sheridan’s Raid to the James River
May 11
Ground Squirrel Church and Yellow Tavern
May 12 Brook Church, Fortifications of Richmond
May 26-28 On line of the Pamunkey
May 27 Hanovertown
May 28 Crump’s Creek and Haw’s Shop
May 28-31 Totopotomoy
June 1-7
Cold Harbor
June 16-August 5 Siege of Petersburg
August 7-
November 28
Sheridan’s Shenandoah Valley Campaign. Attached to Horse Artillery, Army of the Shenandoah, Middle Military Division
August 11 Toll Gate, near White Post, and near Newtown
August 16 Cedarville, Guard Hill or Front Royal
September 19
Third Battle of Winchester (Opequan)
September 20 Near Cedarville
September 21 Front Royal
September 22 Milford
September 29 Waynesboro
October 8-9 Tom’s Brook
October 19
Battle of Cedar Creek
December 19-22 Expedition to Lacey Springs
December Duty in the Shenandoah Valley attached to Reserve Horse Artillery, Army of the Shenandoah
April At Washington, D.C., attached to Horse Artillery Brigade, 22nd Army Corps
August Moved to Fort McHenry, Baltimore, Md.,