The Slaughter Pen is a narrow portion of the Plum Run

Plum Run (Rock Creek)

Plum Run is a Pennsylvania stream flowing southward from the Gettysburg Battlefield between the Gettys-Black Divide on the east and on the west, the drainage divide for Pitzer Run, Biesecker Run, Willoughby Run, and Marsh Creek...

 valley with diabase boulders between Big Round Top

Big Round Top

Big Round Top is a boulder-strewn hill notable as the topographic high point of the Gettysburg Battlefield and for 1863 American Civil War engagements for which Medals of Honor were awarded...

 and Devil's Den

Devil's Den

Devils Den is a boulder-strewn Gettysburg Battlefield hill used by artillery and infantry during the 1863 Battle of Gettysburg, Second Day...

 where on the 1863 Battle of Gettysburg, Second Day

Battle of Gettysburg, Second Day

The Battle of Gettysburg, Second Day was an attempt by Confederate Gen. Robert E. Lee to capitalize on his first day's success. He launched the Army of Northern Virginia in multiple Gettsyburg Battlefield attacks on the flanks of the Union Army of the Potomac, commanded by Maj. Gen. George G...

, the 40th New York Volunteer Infantry Regiment

40th New York Volunteer Infantry Regiment

The 40th New York Volunteer Infantry Regiment, also known as the "Mozart Regiment" or the "Constitution Guard", was an infantry regiment that served in the Union Army during the American Civil War.-Service:...

 forced the 17th and 2nd Georgia Regiment

2nd Georgia Regiment

The 2nd Georgia Regiment was raised on July 5, 1776, at Williamsburg, Virginia for service with the Continental Army. The regiment saw action in Florida in 1777 and 1778, the Siege of Savannah and the Siege of Charleston. The regiment was captured along with the rest of the American southern army...

s of Benning's Brigade from near the Slaughter Pen to a 2nd line in the rocks of Devil's Den

Devil's Den

Devils Den is a boulder-strewn Gettysburg Battlefield hill used by artillery and infantry during the 1863 Battle of Gettysburg, Second Day...

.

Tourist services at the Slaughter Pen included an 1892-1901 trolley park

Trolley park

In the United States, trolley parks, which started in the 19th century, were picnic and recreation areas along or at the ends of streetcar lines in most of the larger cities. These were precursors to amusement parks. These trolley parks were created by the streetcar companies to give people a...

 at the Gettysburg Electric Railway

Gettysburg Electric Railway

The Gettysburg Electric Railway was a borough trolley that provided summer access to Gettysburg Battlefield visitor attractions such as military engagement areas, monuments, postbellum camps, and recreation areas...

's Tipton Station

Tipton Station

Tipton Station was a Gettysburg Battlefield trolley stop of the Gettysburg Electric Railway for passenger access to Crawford's Glen to the north, Devil's Den , and Tipton Park...

 and a 1934- National Park Service

National Park Service

The National Park Service is the U.S. federal agency that manages all national parks, many national monuments, and other conservation and historical properties with various title designations...

 comfort station (40.116111°N 77.186667°W -- temporarily closed due to 1972 sewage pollution in Plum Run).http://news.google.com/newspapers?id=77JbAAAAIBAJ&sjid=IlENAAAAIBAJ&dq=gettysburg%20youth-conservation-corps&pg=3272%2C1022741 A 1982 proposal to route Devil's Den automobile traffic through the Slaughter Pen via a by-pass on the trolley railbed was never completed,http://news.google.com/newspapers?id=LLRcAAAAIBAJ&sjid=TlgNAAAAIBAJ&pg=4642,1250999&dq=slaughter-pen+gettysburg&hl=en and the "Devil's Den Access Committee" was formed in 1988.http://www.google.com/search?q=%22Devil's+Den%22+Gettysburg&tbs=nws:1,ar:1&source=newspapers In 2004, the Slaughter Pen's postbellum path and steps were designated historic district contributing structures.