Battery A was ordered to the camp of the reserves at Tennallytown ; was engaged at Dranesville in December; wintered at Langley; continued with the reserves, and took part in the battles of Gaines' mill, the second Bull Run, South mountain, Antietam and Fredericksburg. When the reserves were relieved and ordered to Washington, the battery was temporarily attached to the 3d division, 1st corps, but was soon assigned to a new command, the Army of Virginia, which it supported for a considerable period. When Richmond was evacuated it was on duty in the city until July, 1865, when it was mustered out at Harrisburg on the 25th. The original members who did not reenlist, were mustered out, May 29, 1864.

Battery B was orderd to Tennallytown on Aug. 14, 1861, and attached to the 1st brigade. It was with the reserves at Mechanicsville, Gaines' mill and Glendale, and was also in action at the second Bull Run, South mountain, Antietam and Fredericksburg. It shared the difficulties of the "Mud March," remained near Fredericksburg during the winter of 1862- 63 and the next summer its guns boomed at Gettysburg. It then moved south with the Army of the Potomac; was with it in the Mine Run campaign; and finally went into winter quarters at Paoli's mills, where a number of the men reenlisted. The remainder were mustered out on June 28, 1864. The battery remained with the Army of the Potomac in the Wilderness campaign, taking part in numerous engagments, and then proceeded to Petersburg, where it arrived on June 17. Here it remained during the siege, participating in the attack on the Weldon railroad, and being often in active service during the winter of 1864-65. In the final assault in April, 1865, the guns of Battery B did good execution. After the fall of Petersburg the battery was ordered to City Point and remained there until May 3, when it left for Washington. On June 9, 1865, the men were mustered out at Harrisburg.

Battery C took part in the skirmish at Chain bridge on the Potomac in the early autumn of 1861 ; was attached to the artillery brigade of Buell's division, defenses of Washington, and on March 10, 1862, was assigned to Couch's division, 4th corps. It participated in the campaign on the Peninsula, including the operations before Yorktown, the battle of Seven Pines and an engagement with cavalry at Glendale. With the 6th corps it was in action at Antietam and was posted on Stafford heights during the battle of Fredericksburg. Early in 1863 Battery C was united with Battery D.

Battery D was first assigned to Buell's division ; took part in the campaign on the Peninsula with Couch's division, 4th corps, being engaged in the siege of Yorktown, the battle of Seven Pines and the short action at Glendale. On July 4 it was selected to fire a national salute. During the remainder of the year it continued in company with Battery C and after they were consolidated, it shelled the works on Marye's heights during the battle of Chancellorsville. After Gettysburg, Battery D was ordered to join the Army of the Shenandoah at Harper's Ferry and was engaged at Cedar creek. It was posted on Maryland heights during the rest of its term of service with a detachment of new recruits who composed a new Battery C. On June 29 and 30, 1865, at Harrisburg, these two batteries were mustered out of service.

Battery E was assigned to duty at Chain bridge with Battery C; then to Buell's division ; next to Couch's division, with which it took part in the same movements on the Peninsula as Battery D. With Battery H it covered the rear after the battle of Gaines' mill, but was not engaged with Batteries C and D at Glendale. After the Peninsular campaign Batteries E and H garrisoned Yorktown and Gloucester. In 1863, Battery E was in action at Drewry's bluff with the Army of the James. It was present at the siege of Petersburg and was assigned to duty in Richmond after the evacuation of the city. On July 4, 1865, it was ordered home and was mustered out at Philadelphia on the 20th.

Battery F was ordered to Tennallytown in August, 1861, but in September joined Gen. Banks' army at Darnestown, Md., which ended its connection with the reserves. On Dec. 20 a detachment under Lieut. Ricketts was engaged at Dam No. 5 on the Upper Potomac and again in Jan., 1862, at Hancock. On Feb. 20, 1862, the battery was united at Hagerstown ; in March it moved up the Shenandoah valley with Gen. Banks and was engaged at Bunker Hill and Newtown. On March 21 it was assigned to Abercrombie's brigade and part of the battery joined in a reconnoissance to Rappahannock Station, where it engaged the enemy. Gen. Hartsuff succeeded Abercrombie on May 1 and took the brigade to Front Royal, hoping to connect with Gen. Fremont and cut off Stonewall Jackson. Failing in this the force returned to Warrenton. The battery was engaged at Cedar mountain, the crossing of the Rappahannock the next day, and a section fought at Thoroughfare gap. It then moved to Bull Run, in which battle it met with disaster, as after that day only one gun in possession of a handful of men remained. In reserve at Chantilly and South mountain, the battery opened the battle at Antietam, after which, in spite of some additions, it was in sad condition from its continued hard service. It was in action at Falmouth for several days after its arrival there in December, and went into winter quarters at Belle Plain, where, in Jan., 1863, it was assigned to the 3d division, 1st corps. After taking part in the battle of Chancellorsville, the battery was attached to Gen. Tyler's reserve artillery and started for Gettysburg. Battery G was attached to Battery F on June 1, and together they were engaged at Gettysburg, in a heroic resistance of the Louisiana Tigers in their historic charge. The losses were terrible but the guns were saved. On July 12 the battery was transferred to the 2nd corps, with which it joined in the pursuit of the enemy, the Mine Run campaign, the Wilderness campaign, and the siege of Petersburg. It was mustered out at Harrisburg, June 9, 1865.

Battery G was ordered to join the reserves at Tennallytown ; participated with the reserves in the battles on the Peninsula, the second Bull Run and Fredericksburg. The loss at Bull Run was 3 men killed and 21 wounded, besides 4 guns, 2 caissons, 2 limbers and 27 horses captured. The battery returned to Washington for a new equipment and was in condition for effective service at Fredericksburg. It shared in the battle of Chancellorsville in the spring of 1863 and then became a section of Battery F until April 3, 1864, when it was ordered to Washington, newly equipped and posted at Arlington. On July 3, it was ordered to Point of Rocks, where it was stationed, the men armed with muskets, until Dec. 12. The muskets were then exchanged for 6 guns and the battery was stationed on Maryland heights until April 16, 1865, when it turned in its guns and joined the defenses of Washington. Again armed with muskets the men were stationed at Fort Foote during the remainder of their service. They were mustered out at Philadelphia June 29, 1865.

Battery H was associated with Batteries D and E during the Peninsular campaign. In July it was made a reserve battery of the 4th corps. In June, 1863, it was ordered to Washington and posted at Camp Barry as a reserve battery. In May, 1864, it was dismounted and posted at Fort Whipple. In the winter of 1864 it was sent to Fort Marcy near Chain bridge on the Potomac, and later to Edwards' ferry. It was mustered out of the service at Philadelphia, June 27, 1865.

Battery I, added to the regiment on March 2, 1865, was ordered to the defenses of Washington and remained there until mustered out at Philadelphia on July 1.