2nd Pennsylvania Reserves

2nd Pennsylvania Reserves
Unit name	2nd Pennsylvania Reserves
Dates	1861–1864
Country	United States
Allegiance	Union
Branch	Union Army
Type	Infantry
Size	Regiment
Notable commanders	George A. McCall; Edward D. Baker; John F. Reynolds

2nd Pennsylvania Reserves The 2nd Pennsylvania Reserves, also known as the 31st Pennsylvania Volunteer Infantry in some official returns, was an infantry regiment raised in Pennsylvania that served in the Army of the Potomac during the American Civil War. Organized during the mobilization that followed Fort Sumter and the First Battle of Bull Run, the regiment participated in the Peninsula Campaign, the Seven Days Battles, and later operations in northern Virginia and Maryland before veterans' discharges in 1864. The unit's service intersected with major figures and formations such as George B. McClellan, Ulysses S. Grant, George G. Meade, Robert E. Lee, and the Army of Northern Virginia.

Formation and Organization

Raised in 1861 under Pennsylvania state authority, the regiment was recruited in counties near Philadelphia, reflecting local responses to President Abraham Lincoln's calls for volunteers after the fall of Fort Sumter. Initial mustering placed the regiment within the Pennsylvania Reserves division, commanded by George A. McCall, and attached to brigades alongside units like the 1st Pennsylvania Reserves, 3rd Pennsylvania Reserves, and regiments from New Jersey and New York. Officers included men with prior militia experience and rising political figures associated with the Republican Party, aligning with state governors such as Andrew Curtin who oversaw Pennsylvania's wartime mobilization. The regiment's structure conformed to United States Army infantry organization with ten companies, regimental staff, and attached artillery or cavalry detachments as operational needs demanded.

Service and Campaigns

After training near Harrisburg, Pennsylvania and Philadelphia, the 2nd Pennsylvania Reserves crossed into Virginia with the Army of the Potomac during the spring 1862 Peninsula Campaign. In operations ordered by George B. McClellan, the regiment fought in reconnaissance actions and major engagements during McClellan's advance toward Richmond, Virginia. Subsequent reassignment placed the unit in John Pope's theater during the Northern Virginia Campaign and later under corps commanders such as Ambrose Burnside and Joseph Hooker during the Maryland Campaign and movements around Fredericksburg. The regiment served through shifting strategic phases including the Seven Days Battles, the Battle of Antietam, and maneuvers preceding the Gettysburg Campaign before veteran reenlistments and expiration of terms led to consolidation and mustering out in 1864.

Engagements and Battles

The 2nd Pennsylvania Reserves saw action in numerous named battles and smaller engagements across the Eastern Theater. Significant fights included the Battle of Gaines' Mill and Battle of Malvern Hill during the Seven Days Battles, where union formations under George B. McClellan engaged Robert E. Lee's Army of Northern Virginia. The regiment participated in the Battle of South Mountain and fought at Antietam in actions coordinated by commanders such as George B. McClellan and Joseph Hooker. During operations in northern Virginia the regiment encountered forces under generals like James Longstreet and Stonewall Jackson, and took part in picket actions, skirmishes, and the defense of key crossings over the Potomac River and along the Rappahannock River. The unit's operational history also intersected with campaigns involving John F. Reynolds and Winfield Scott Hancock in corps-level movements.

Commanders and Leadership

Regimental leadership included field officers with ties to state and federal command structures. Brigade and division-level oversight came from figures such as George A. McCall, whose Pennsylvania Reserves division provided the organizational identity for the regiment. Corps and army-level commanders who directed campaigns affecting the regiment included George B. McClellan, John Pope, Ambrose Burnside, Joseph Hooker, and George G. Meade. The regiment's company officers often had prior militia service and connections to local political leaders like Andrew Curtin and national figures such as Abraham Lincoln who influenced appointments and promotions. Tactical interactions placed officers in contact with Confederate leaders including Robert E. Lee, James Longstreet, and Thomas "Stonewall" Jackson.

Casualties and Strength

Throughout its service the 2nd Pennsylvania Reserves experienced casualties typical of front-line Union infantry regiments engaged in major Eastern Theater operations. Losses occurred at the Seven Days Battles, during the Maryland Campaign, and in repeated skirmishes along the Rappahannock River. Disease, exposure, and combat combined to reduce effective strength ahead of reenlistment periods overseen by state mustering authorities in Harrisburg, Pennsylvania and federal mustering officers tied to the War Department. Muster rolls and returns reflected transfers to other units such as the 3rd Pennsylvania Reserves and occasional consolidations prompted by attrition and orders from corps headquarters under commanders like Joseph Hooker.

Equipment and Uniforms

The regiment's armament and clothing paralleled standard issue for Union infantry in the Eastern Theater: rifled muskets supplied through state and federal channels managed by the Quartermaster Department and ordnance distributed via depots in Washington, D.C. and Philadelphia. Uniforms followed United States Army regulation patterns with variations reflecting state-issued accoutrements and locally procured items, producing a mix of regulation frock coats, forage caps, and kepis visible in period photographs and illustrations alongside personal equipment such as cartridge boxes, bayonets, and canteens. Logistics and supply lines tied the regiment to transportation hubs like Baltimore and rail lines leading to Alexandria, Virginia.

Legacy and Commemoration

The 2nd Pennsylvania Reserves is commemorated in Pennsylvania military histories, veterans' reunions, and battlefield monument programs at sites such as Antietam National Battlefield and locations associated with the Seven Days Battles. Regimental histories and veterans' memoirs connected the unit to broader narratives of Pennsylvania's contribution to the Union effort, involving figures commemorated by monuments and civic memorials linked to Andrew Curtin and state historical societies. The regiment's lineage and service are preserved in archives held by institutions like the Pennsylvania Historical and Museum Commission and local historical societies near Philadelphia and Harrisburg, contributing to interpretive work at national park units and in scholarly treatments of the Army of the Potomac and the Eastern Theater.

Category:Units and formations of the Union Army from Pennsylvania