Battery K is referenced on a War Department marker at Antietam and honored by two identical monuments on the battlefield at Gettysburg.

September Organized in Washington
October Duty in the Defenses of Washington, D. C, attached to Provost Guard, Army Potomac
March Ordered to the Virginia Peninsula. Attached to Artillery Reserve, Army Potomac
April 5-May 4 Siege of Yorktown, Va.
May Attached to 2nd Brigade, Artillery Reserve, 5th Army Corps, Army Potomac
June 25-July 1 Seven days before Richmond
June 26 Mechanicsville
June 27 Gaines’ Mill
June 30 Turkey Bridge
July 1 Malvern Hill
July At Harrison’s Landing
August 16-28 Movement to Centreville, Va.
August 28-September 2 Pope’s Campaign in Northern Virginia
August 29 Battle of Groveton
August 30
Second Battle of Bull Run
September 6-22 Maryland Campaign. Attached to Artillery, 2nd Division, 5th Army Corps
September 11 Marched from Rockville about 7 miles on the Frederick Road
September 12 Passed through Clarksburg and to Hyattsville
September 13 Left Hayattsville at 6 a.m., passd through Urbana and arrived at Frederick at 4 p.m.
September 14 Marched to Middletown
September 15 Marched 6 miles over South Mountain
September 16-17
Battle of Antietam

The battery was commanded by Lieutenant William E. Van Reed. It was armed with four 12-pounder Napoleons.

From the war Department marker on the Antietam battlefield:

Battery K, 5th U.S. Artillery, crossed the Antietam by the Middle Bridge and about 2 P.M., September 17, relieved Battery M, 2d U.S. Artillery, taking position on the ridge immediately north of this point. After the expenditure of 400 rounds of ammunition at 5 P.M., the Battery was relieved in turn, by Battery M. 2d U.S. Artillery, soon after which it recrossed the Antietam.

September 16 In camp near Antietam Creek. One spoke of a wheel on the battery wagon broken by enemy shot
September 17 Went into position across the creek and fired about 400 rounds, and withdrew at dusk
September 19
Shepherdstown Ford

Marched at 10 a.m.; passed through Sharpsburg about 12 m. One man was wounded (afterward died), and 2 horses had their legs broken by a shot from the enemy.

September 20

The battery went into position near the Potomac and fired about 50 rounds at the enemy

October 30-November 19 Movement to Falmouth, Va. Attached to Artillery Reserve, Army Potomac
December 12-15 Battle of Fredericksburg, Va.
April 27-May 6 Chancellorsville Campaign
May 1-5
Battle of Chancellorsville
May Attached to Artillery Brigade, 12th Army Corps, Army Potomac
July 1-3
Battle of Gettysburg

Commanded by Lieutenant David H. Kinzie, the battery brought four 12 Poundersto the field.

From the monument at Gettysburg:

July 1 Marched to within a mile and a half of Gettysburg

July 2 At Daylight took position to command a gap between the First and Twelfth Corps. At 5 p.m. one section was placed on the summit of Culp’s Hill and assisted in silencing Confederate Batteries on Benner’s Hill. At 6 p.m. rejoined the battery at the foot of Power’s Hill

July 3 At 1 p.m. posted with Battery F 4th U.S. Artillery on the south side of Baltimore Pike opposite the centre of the line of the Twelfth Corps. At 4:30 a.m. opened fire on the Confederates in possession of the line vacated by the Twelfth Corps the preceding night. Firing continued at intervals until after 10 a.m. when the Confederates were driven out. Remained in the same position exposed to the severe shelling which came over Cemetery Hill in the afternoon.

Casualties: wounded 5 men

September 24-October 3 Movement to Bridgeport, Ala. Attached to Artillery, 2nd Division, 12th Army Corps, Army of the Cumberland
October-November Operations on line of Memphis & Charleston Railroad
November 23-27 Chattanooga-Ringgold Campaign
December At Chattanooga, Tenn.
March Attached to 1st Division. Artillery Reserve, Dept. Cumberland
August Atlanta Campaign. Attached to Artillery Brigade, 20th Army Corps, Army of the Cumberland
August 25-
September 2
Siege of Atlanta
August 26-September 2 Operations at Chattahoochie River Bridge
September Occupation of Atlanta
October Garrison duty at Chattanooga, Tenn., Dept. of the Cumberland to August 1865