The 45th Pennsylvania Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.
Service
The 45th Pennsylvania Infantry was organized beginning July 28, 1861 and mustered in October 21, 1861 at Camp Curtin in Harrisburg, Pennsylvania for a three-year enlistment under the command of Colonel Thomas Welsh.
The 45th Pennsylvania Infantry mustered out July 17, 1865.
Affiliations, battle honors, detailed service, and casualties
Organizational affiliation
Attached to: Jamison's Brigade, Heintzelman's Division, Army of the Potomac, to October 1861. Department of the South, to July, 1862. 2nd Brigade, 1st Division. IX Corps, AoP, to September, 1862. 1st Brigade, 1st Division. IX Corps, AoP, to April, 1862. 1st Brigade, 1st Division. IX Corps, Army of the Ohio (AoO), to June. 1863. 3rd Brigade. 1st Division, IX Corps, Army of the Tennessee, to August. 1863. 1st Brigade, 1st Division. IX Corps, AoO, to April, 1864. 2nd Brigade, 3rd Division, IX Corps, AoP, to September. 1st Brigade, 1st Division, IX Corps, AoP to October, 1864. 1st Brigade, 2nd Division, IX Corps, Army of the Potomac, to July 1865.
List of battles
The official list of battles in which the regiment bore a part:
Battle of Secessionville
Battle of South Mountain
Battle of Antietam
Battle of Fredericksburg
Siege of Vicksburg
Siege of Jackson
Knoxville Campaign
Overland Campaign
Battle of the Wilderness
Battle of Spotsylvania Court House
Battle of North Anna
Battle of Totopotomoy Creek
Battle of Cold Harbor
Siege of Petersburg
Battle of the Crater
Battle of Globe Tavern
Battle of Boydton Plank Road
Battle of Fort Stedman
Appomattox Campaign
Third Battle of Petersburg
Detailed service
(NOTE — Battles are Bolded, Italicized; campaigns are Italicized)
1861
Moved to Washington, D.C., October 21–23
Expedition into lower Maryland November 3–11, 1861
Moved to Baltimore, Md., then to Fort Monroe, Va., November 19–21
Sailed for Port Royal, S.C., December 6–8
Companies A, C, D, E, and I assigned to duty at Bay Point; Companies B, F, G, H, and K occupied Otter Island, S.C., December 11, and duty there until May 1862; Companies F and K occupied Fenwick Island December 20, 1861; Company F at Fenwick Island April 4 to May 20, 1862; Companies B, F, G, H, I, and K moved to North Edisto Island, S.C., May 21, 1862
1862
Operations against James Island, SC, May 21-June 28
Action on James Island June 10. Battle of Secessionville June 16 Evacuation of James Island and movement to Hilton Head June 28-July 1 Moved to Newport News, Va., July 18–21, then to Aquia Creek August 4–5 Operations on the Rapidan and Rappahannock Rivers until September At Brook's Station August 5–29 Destruction of bridges at Potomac Creek and Brook's Station September 4 Destruction of stores at Aquia Creek September 6 Battle of South Mountain September 14 Battle of Antietam September 16–17 Duty at Pleasant Valley, Md., until October 26 Marched to Lovettsville, Va., October 26–29; then to Warrenton October 29-November 19 Battle of Fredericksburg December 12–15