William Penn Annex East in Philadelphia in Philadelphia County, Pennsylvania — The American Northeast (Mid-Atlantic)
Benedict Arnold
1741 - 1801
| | American Commander of Philadelphia 1778 - 1779 | |
American Hero Turned Traitor
America's most notorious traitor was born in the Colony of Connecticut and as a teenager, served in the Connecticut militiar during the French and Indian War. He became a wealthy merchant in New Haven and smuggled goods in protest of the British tariffs. Once war broke out, Arnold joined the Continental Army and gained a reputation for bravery and strategy. Arnold helped capture Fort Ticonderoga in 1775 (giving Washington's army time to prepare for the British attack on New York City) and helepd stall British forces at the Battle of Valcour Island in 1776. He was promoted to major general and led a decisive charge at the Battle of Saratoga, where he received a leg wound. This injury took him off the battlefield, leading Washington to appoint him the military commander of Philadelphia after the British withdrew from the city in June 1778.
At this time, Arnold was bitter and believed he had been passed over for a promotion in the Continental Army. His time in Philadelphia was marked by extravagance, and charges of corruption were leveled against him for which he was court-martialed. While living at the President's House, Arnold met loyalist Peggy Shippen, who became his second wife, and began his defection to the British.
Through Shippen, Arnold wsa introduced to British officers, including Major John Andrι, whom he began supplying with military intelligence. The British promised Arnold £20,000 if he turned West Point over to them, and he soon began making plans to surrender the fort. His treasonous plot was discovered when American soldiers caught Andrι with Arnold's letters. Arnold escaped and received a commission in the British Army, seeing action in Virginia and leading a raid on Richmond. As the Revolution ended, Arnold moved to London with his wife Peggy. His reputation as a traitor followed him, and he was deeply unpopular even among the British. Arnold died in London in 1791 at the age of 60.
[Caption:]
Benedict Arnold,engraving by H. B. Paul, 1865. Courtesy of Library of Congress.
Erected 2026 by National Park Service, U.S. Department of the Interior.
Topics. This historical marker is listed in these topic lists: Industry & Commerce • War, French and Indian • War, US Revolutionary. A significant historical month for this entry is June 1778.
Location. 39° 57.027′ N,

Photographed by Devry Becker Jones (CC0), July 25, 2026
2. Several markers on display on the grounds of Independence National Historical Park
Regionally, this marker is in Southeast Pennsylvania. It is also in the American Northeast and in the Mid-Atlantic. Globally, it is in North America, the Western Hemisphere, the Western World, and the Anglosphere. Historically, it finds itself in what was once the Haudenosaunee (Iroquois) Confederacy, New Netherland, and one of the original Thirteen Colonies.
Other nearby markers. At least 6 other markers are within walking distance of this marker: Robert Morris (here, next to this marker); George and Martha Washington (here, next to this marker); John Adams (here, next to this marker); The President's House (here, next to this marker); William Howe (here, next to this marker); Selecting a President (here, next to this marker). Touch for a list and map of all markers in Philadelphia.
Other markers no longer nearby. "I and my household" (was here, next to this marker but has been replaced with another marker now near it); Washington's Death and a Renewed Hope for Freedom (was here, next to this marker but has been replaced with another marker now near it); "I am free now" (was here, next to this marker but has been permanently removed); "We shall come to a civil war" (was here, next to this marker but has been permanently removed); "An Act respecting fugitives from Justice" (was here, next to this marker but has been replaced with another marker now near it); The opener of the Way (was here, next to this marker but has been replaced with another marker now near it); "Burn this treaty to Hell!" (was here, next to this marker but has been replaced with another marker now near it); "I will fear no Evil" (was here, next to this marker but has been replaced with another marker now near it); The Dirty Business of Slavery (was here, next to this marker but has been permanently removed); Suppressing the Opposition (was here, next to this marker but has been replaced with another marker now near it).
Credits. This page was last revised on July 27, 2026. It was originally submitted on July 27, 2026, by Devry Becker Jones of Washington, District of Columbia. This page has been viewed 6 times since then. Photos: 1, 2. submitted on July 27, 2026, by Devry Becker Jones of Washington, District of Columbia.
