The regiment was organized at
Philadelphia,
Pennsylvania, by the consolidation of Robert's Battalion Pennsylvania Heavy Artillery (redesignated Companies C, D, and F), Segebarth's Battalion Marine Artillery (Companies A, B, G, H, K, and L), and the 1st Battalion Pennsylvania Heavy Artillery (Company E). Companies I and M were organized in Philadelphia. Recruiting finished on February 17, 1863, with Joseph Roberts as
colonel, R. V. W. Howard as
lieutenant colonel, and John A. Darling as
major. The regiment was sent to
Fort Monroe in
Virginia, except for Company H, which was sent to
Baltimore,
Maryland. During the
Suffolk Campaign, companies A, B, F, and G were sent to
Suffolk and participated in the
siege. During the
Gettysburg campaign, Company H was assigned to the Second Division of the
Army of the Potomac's
Cavalry Corps and was present at the
Battle of Gettysburg on July 2 and 3 1863. It fought at the
East Cavalry Battlefield on July 3. After the campaign, the company returned to Baltimore, where it remained for the remainder of the war. In the spring of 1864, the regiment was above its authorized strength, so its surplus men were organized into the
188th Pennsylvania Infantry. Shortly afterwards, it received more recruits, so it remained above strength. During the
Siege of Petersburg, Companies D, E, G, and N were assigned to the
Army of the James to serve in
light artillery batteries and to work on various parts of the fortifications. Detachments from various companies were assigned to the Naval Brigade, which fought along the rivers around
Richmond and
Petersburg during 1864 and 1865. Company I was selected as the guard company for the headquarters of the Army of the James. Following the capture of Richmond, the regiment was reassigned to Fort Monroe, where it provided the guard for
Jefferson Davis' imprisonment there. Companies A and B were mustered out at Fort Monroe on July 11, 1865; company H was mustered out at Baltimore on July 25; and the remaining companies were mustered out at Fort Monroe on November 9. ==Casualties==