The 4th Pennsylvania Reserve Regiment, also known as the 33rd Pennsylvania Volunteer Infantry Regiment, was an infantry

Infantry

Infantrymen are soldiers who are specifically trained for the role of fighting on foot to engage the enemy face to face and have historically borne the brunt of the casualties of combat in wars. As the oldest branch of combat arms, they are the backbone of armies...

 regiment

Regiment

A regiment is a major tactical military unit, composed of variable numbers of batteries, squadrons or battalions, commanded by a colonel or lieutenant colonel...

 that served in the Union Army

Union Army

The Union Army was the land force that fought for the Union during the American Civil War. It was also known as the Federal Army, the U.S. Army, the Northern Army and the National Army...

 during the American Civil War

American Civil War

The American Civil War was a civil war fought in the United States of America. In response to the election of Abraham Lincoln as President of the United States, 11 southern slave states declared their secession from the United States and formed the Confederate States of America ; the other 25...

. It was a part of the famed Pennsylvania Reserves

Pennsylvania Reserves

The Pennsylvania Reserves were an infantry division in the Union Army during the American Civil War. Noted for its famous commanders and high casualties, it served in the Eastern Theater, and fought in many important battles, including Antietam and Gettysburg....

 in the Army of the Potomac

Army of the Potomac

The Army of the Potomac was the major Union Army in the Eastern Theater of the American Civil War.-History:The Army of the Potomac was created in 1861, but was then only the size of a corps . Its nucleus was called the Army of Northeastern Virginia, under Brig. Gen...

 for much of the early part of the war, and served in the Eastern Theater

Eastern Theater of the American Civil War

The Eastern Theater of the American Civil War included the states of Virginia, West Virginia, Maryland, and Pennsylvania, the District of Columbia, and the coastal fortifications and seaports of North Carolina...

 in a number of important battles, including Antietam

Battle of Antietam

The Battle of Antietam , fought on September 17, 1862, near Sharpsburg, Maryland, and Antietam Creek, as part of the Maryland Campaign, was the first major battle in the American Civil War to take place on Northern soil. It was the bloodiest single-day battle in American history, with about 23,000...

 and Fredericksburg

Battle of Fredericksburg

The Battle of Fredericksburg was fought December 11–15, 1862, in and around Fredericksburg, Virginia, between General Robert E. Lee's Confederate Army of Northern Virginia and the Union Army of the Potomac, commanded by Maj. Gen. Ambrose E. Burnside...

.

Service

The 4th Pennsylvania Reserves were raised at Harrisburg, Pennsylvania

Harrisburg, Pennsylvania

Harrisburg is the capital of Pennsylvania. As of the 2010 census, the city had a population of 49,528, making it the ninth largest city in Pennsylvania...

, on July 17, 1861. Robert G. March served as its first colonel

Colonel

Colonel , abbreviated Col or COL, is a military rank of a senior commissioned officer. It or a corresponding rank exists in most armies and in many air forces; the naval equivalent rank is generally "Captain". It is also used in some police forces and other paramilitary rank structures...

, John F. Gaul as lieutenant colonel

Lieutenant colonel

Lieutenant colonel is a rank of commissioned officer in the armies and most marine forces and some air forces of the world, typically ranking above a major and below a colonel. The rank of lieutenant colonel is often shortened to simply "colonel" in conversation and in unofficial correspondence...

, and Robert M. McClure as major

Major

Major is a rank of commissioned officer, with corresponding ranks existing in almost every military in the world.When used unhyphenated, in conjunction with no other indicator of rank, the term refers to the rank just senior to that of an Army captain and just below the rank of lieutenant colonel. ...

. The regiment trained near Easton

Easton, Pennsylvania

Easton is a city in Northampton County, Pennsylvania, United States. The population was 26,800 as of the 2010 census. It is the county seat of Northampton County....

 until mid-July, when it was transferred to Camp Curtin

Camp Curtin

Camp Curtin was a military training camp in Harrisburg, Pennsylvania, during the American Civil War.When news of the bombardment and subsequent surrender of Fort Sumter in Charleston, South Carolina reached Washington, D.C. on April 14, 1861, President Abraham Lincoln called for 75,000 volunteers...

 in Harrisburg and then to Baltimore. On October 1, March was forced to resign due to illness and was succeeded by Lt. Col. Albert L. Magilton of the 2nd Reserves. The 4th became part of the 2nd Brigade of the Pennsylvania Reserves division

Division (military)

A division is a large military unit or formation usually consisting of between 10,000 and 20,000 soldiers. In most armies, a division is composed of several regiments or brigades, and in turn several divisions typically make up a corps...

, part of the I Corps

I Corps (ACW)

I Corps was the designation of three different corps-sized units in the Union Army during the American Civil War. The units served in the following armies:...

, Army of the Potomac.

At first remaining with the I Corps in northern Virginia

Virginia

The Commonwealth of Virginia , is a U.S. state on the Atlantic Coast of the Southern United States. Virginia is nicknamed the "Old Dominion" and sometimes the "Mother of Presidents" after the eight U.S. presidents born there...

, the 4th, along with the rest of the division, was sent to the Army outside of Richmond

Richmond, Virginia

Richmond is the capital of the Commonwealth of Virginia, in the United States. It is an independent city and not part of any county. Richmond is the center of the Richmond Metropolitan Statistical Area and the Greater Richmond area...

, where it was reassigned to the V Corps

V Corps (ACW)

The V Corps was a unit of the Union Army of the Potomac during the American Civil War.-1862:The corps was first organized briefly under Nathaniel P. Banks, but then permanently on May 18, 1862, designated as the "V Corps Provisional"...

. During the Peninsula Campaign

Peninsula Campaign

The Peninsula Campaign of the American Civil War was a major Union operation launched in southeastern Virginia from March through July 1862, the first large-scale offensive in the Eastern Theater. The operation, commanded by Maj. Gen. George B...

, it fought in the Seven Days Battles

Seven Days Battles

The Seven Days Battles was a series of six major battles over the seven days from June 25 to July 1, 1862, near Richmond, Virginia during the American Civil War. Confederate General Robert E. Lee drove the invading Union Army of the Potomac, commanded by Maj. Gen. George B. McClellan, away from...

, losing about 200 men. The regiment lost 27 men at the Battle of South Mountain

Battle of South Mountain

The Battle of South Mountain was fought September 14, 1862, as part of the Maryland Campaign of the American Civil War. Three pitched battles were fought for possession of three South Mountain passes: Crampton's, Turner's, and Fox's Gaps. Maj. Gen. George B...

 and another 49 men at Antietam. After Fredericksburg, the 2nd Brigade, including the 4th Pennsylvania Reserves, was transferred from the Army of the Potomac in early 1863 to serve in the defenses of Washington, D.C.

Washington, D.C.

Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....

. In 1864, it served in West Virginia

West Virginia

West Virginia is a state in the Appalachian and Southeastern regions of the United States, bordered by Virginia to the southeast, Kentucky to the southwest, Ohio to the northwest, Pennsylvania to the northeast and Maryland to the east...

, fighting at the Battle of Cloyd's Mountain

Battle of Cloyd's Mountain

The Battle of Cloyd's Mountain was a Union victory in western Virginia in 1864 that allowed the Union forces to destroy the last railroad connecting Tennessee to Virginia.-Background:...

, where the regiment's colonel, Richard H. Woolworth, was mortally wounded.

The depleted regiment was mustered out in Philadelphia on June 15, 1864, when its original three-year term of enlistment expired. Men who reenlisted and those replacements whose enlistments had not yet expired were transferred to the 54th Pennsylvania Volunteer Infantry on June 8.

Casualties

The 4th Pennsylvania Reserves suffered 2 officers and 76 enlisted men killed in battle or died from wounds, and 1 officer and 60 enlisted men dead from disease, for a total of 139 fatalities.

Commanders

• Col. Robert G. March, July 17 to October 1, 1861 (resigned due to illness)
• Lt. Col. (to Col. 10/1/61) Albert L. Magilton, October 1, 1861 to September 14, 1862 (became brigade commander)
• Maj. John Nyce, September 14 to November 29, 1862 (Promoted to Colonel of 174th Pennsylvania)
• Col. Albert L. Magilton, November 29, 1862 to December 28, 1862 (resigned)
• Lt. Col. (to Col. 3/1/63) Richard H. Woolworth, December 28, 1862 to May 9, 1864 (killed at Cloyd's Mountain)
• Lt. Col. (to Col. 5/10/64) Thomas F.B. Tapper, May 9, 1864 to June 17, 1864 (mustered out)