121st Pennsylvania Infantry in the American Civil War

Overview

The 121st Pennsylvania Infantry (Three Years’ Service) was an infantry regiment organized in Pennsylvania during the American Civil War. The regiment was recruited primarily from Philadelphia and Venango County and mustered into United States service for a three-year term in September 1862 at Philadelphia. Serving in the Army of the Potomac, the 121st Pennsylvania participated in many of the major campaigns and battles in the Eastern Theater, including Fredericksburg, Gettysburg, the Wilderness, and the final Appomattox Campaign.

The regiment is noted for its heavy losses at Gettysburg and its continued service through the end of the war, mustering out in June 1865. It was attached to various brigades and divisions within the V Corps and was present at the surrender of the Army of Northern Virginia.

Organization & Service

The 121st Pennsylvania Infantry (Three Years’ Service) was organized in Philadelphia and Venango County and mustered into service in September 1862. After organization, the regiment was ordered to Washington, D.C., where it was attached to Casey’s provisional brigade. In October 1862, it joined General Meade’s division near Antietam, Maryland.

The regiment’s first major engagement was at Fredericksburg in December 1862. Following this battle, the 121st encamped at Belle Plain for the winter. In January 1863, it participated in the “Mud March,” and in May, it took part in the Chancellorsville Campaign before returning to camp near Falmouth, Virginia. During the Gettysburg Campaign, the regiment was heavily engaged on July 1, 1863, suffering significant casualties. It remained active on July 3 and joined in the pursuit of the Confederate army after the battle.

After Gettysburg, the 121st Pennsylvania performed guard duty at Kelly’s Ford and Cedar Run Bridge near Catlett’s Station, and participated in the Mine Run Campaign. The regiment wintered at Culpeper, Virginia. In the spring of 1864, it was attached to the V Corps and fought in the Wilderness, suffering heavy losses. The regiment continued to see action at Spotsylvania, Jericho Ford, Bethesda Church, and Cold Harbor, where it was assigned to the 1st Division.

During the Petersburg Campaign, the 121st aided in constructing defensive works known as “Fort Hell” and participated in the Weldon Railroad raid in August 1864. At Peebles’ Farm, the regiment, then part of the 3rd Brigade, 3rd Division, suffered the capture of a large number of its men. The remaining members took part in further operations on the Weldon Railroad in December, the Hatcher’s Run movement in February 1865, and the Boydton Plank Road engagement in March. The regiment was active at the Battle of Five Forks and was present at the surrender of Lee’s army at Appomattox Court House. After a brief period of guard duty and encampment on the South Side Railroad, the 121st Pennsylvania Infantry was mustered out in Washington, D.C., on June 2, 1865.

Engagements & Campaigns

• Fredericksburg (December 1862)
• “Mud March” (January 1863)
• Chancellorsville Campaign (May 1863)
• Gettysburg Campaign (July 1863)
• Kelly’s Ford and Cedar Run Bridge guard duty
• Mine Run Campaign (November–December 1863)
• Wilderness (May 1864)
• Spotsylvania
• Jericho Ford
• Bethesda Church
• Cold Harbor
• Petersburg Siege (including construction of “Fort Hell”)
• Weldon Railroad Raids (August and December 1864)
• Peebles’ Farm
• Hatcher’s Run (February 1865)
• Boydton Plank Road (March 1865)
• Five Forks
• Appomattox Campaign and Lee’s surrender (April 1865)

Casualties

According to Fox’s Regimental Losses and state records, the 121st Pennsylvania Infantry suffered heavy casualties, particularly at Gettysburg and in the Overland Campaign. At Gettysburg, out of 263 men engaged, only 84 reported for duty after July 1, 1863. Detailed figures for killed, wounded, and died of disease are as follows when available:

• Killed or mortally wounded: Some details are incomplete in surviving primary sources.
• Died of disease: Some details are incomplete in surviving primary sources.
• Total losses: Some details are incomplete in surviving primary sources.

Field Officers & Commanders

• Colonel Chapman Biddle
• Colonel Alexander Biddle
• Colonel James Ashworth
• Lieutenant Colonel Elisha W. Davis
• Lieutenant Colonel Alexander Biddle
• Lieutenant Colonel James Ashworth
• Lieutenant Colonel Thomas M. Hall
• Lieutenant Colonel Samuel T. Lloyd
• Lieutenant Colonel James S. Warner
• Major Alexander Biddle
• Major James Ashworth
• Major Thomas M. Hall
• Major West Funk

Regimental Roster

The full roster of the 121st Pennsylvania Infantry (Three Years’ Service), including officers and enlisted men, is available for genealogical and historical research. This roster provides names, ranks, and service details as recorded in official state and federal records.

To view the complete roster, visit the 121st Pennsylvania Infantry (Three Years’ Service) Roster page.

Sources & References

• Official Records of the Union and Confederate Armies, Series I, various volumes and parts (Army of the Potomac, V Corps, 1862–1865)
• Pennsylvania Adjutant General’s Report, 1865
• Dyer, Frederick H. A Compendium of the War of the Rebellion
• Fox, William F. Regimental Losses in the American Civil War
• The Union Army, Federal Publishing Company, 1908, Volume 1