Question: Margaret "Peggy" Shippen, was the second wife of which general during the American Revolutionary War, who fought for the American Continental Army, and later defected to the British Army?

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Nicholas Haussegger: Nicholas Haussegger (1729 – July 1786) was born in Switzerland and fought in the British army during the French and Indian War.  After the war he became a leader in the Pennsylvania German community.  At the beginning of the American Revolutionary War he joined the 4th Pennsylvania Battalion as a field officer.  He was placed in command of the German Battalion, a unit of ethnic Germans from Pennsylvania and Maryland.  He led his battalion effectively at Trenton in late December 1776.  A week later, he was captured at Assunpink Creek under questionable circumstances.  He apparently defected to the British and George Washington had him watched after he was sent home on parole.  He was stricken from the Continental Army in March 1777.  Evidence suggests that he was in contact with the British during the war.  In 1782 he was declared a traitor and his property forfeited.  He died in July 1786.

National Memorial Arch: The United States National Memorial Arch, located in Valley Forge National Historical Park, Chester County, Pennsylvania, is a monument built to celebrate the arrival of General George Washington and the Continental Army at Valley Forge.  Valley Forge was the military camp 18 miles northwest of Philadelphia where the American Continental Army spent the winter of 1777–78 during the American Revolutionary War.  Starvation, disease, malnutrition, and exposure killed more than 2,500 American soldiers by the end of February 1778.

Battle of Germantown: The Battle of Germantown was a major engagement in the Philadelphia campaign of the American Revolutionary War.  It was fought on October 4, 1777, at Germantown, Pennsylvania, between the British Army led by Sir William Howe, and the American Continental Army, with the 2nd Canadian Regiment, under George Washington.

List of Continental Army units: The Continental Army was the national army of first the Thirteen Colonies, and then the independent United States, during the American Revolutionary War, established by a resolution of the Congress on June 14, 1775, three days before the Battle of Bunker Hill, where it saw its first action under that title. .  The Continental Congress took a number of steps in the spring of 1775 to create the army in response to the Battles of Lexington and Concord in April and the seizure of Fort Ticonderoga in May.  The units composing the Continental Army changed frequently, especially in the first two years of the war.  From 1777 to the close of the war, the organization of the Continental Army became progressively more systematic and sophisticated.  The Continental Army that served at Yorktown in 1781 bore very little resemblance to the Continental Army that blockaded Boston in 1775.

2nd Virginia State Regiment: The 2nd Virginia State Regiment was a regiment of the Virginia Militia that fought during the American Revolutionary War.  The regiment was authorized by the General Assembly of the Commonwealth of Virginia in December, 1776 as a force of regular troops for the Commonwealth's defense.  In January, 1778, with low recruitment to the Virginia line of the Continental Army and in the wake of heavy losses to Virginia regiments at the Battle of Germantown, the 2nd Virginia State Regiment was sent by Governor Patrick Henry (per an act of the General Assembly) to join the Continental Army in the Philadelphia Campaign.  By May, 1778, the regiment was in Valley Forge training with the Continental Army.  The regiment camped at Middlebrook in the winter of 1778-79 and participated in the Battle of Monmouth.  The regiment remained in the service of the Continental Army until late 1779 when called back to Virginia.  In April and May 1780, most of the regiment was discharged.  The remaining companies of the Virginia state regiments were organized under Colonel Charles Dabney in the summer of 1781 and were under his command at the siege of Yorktown.

1st Virginia State Regiment: The 1st Virginia State Regiment was a regiment of Virginia Militia that fought during the American Revolutionary War.  The regiment was authorized by the General Assembly of the Commonwealth of Virginia in December 1776 as a force of regular troops for the Commonwealth's defense.  In 1777, Virginia had difficulty meeting its quota for the regular line of the Continental Army.  As a result, in July 1777 under the command of Colonel George Gibson, the regiment began a march North to temporarily join the Continental Army in the Philadelphia Campaign.  In January 1778, the Virginia General Assembly passed an act directing that the 1st Virginia State Regiment "now in Continental service, be continued in said service instead of the Ninth Virginia Regiment, made prisoners by the enemy in the Battle of Germantown."  The regiment camped at Valley Forge in the winter of 1777-78 and at Middlebrook in the winter of 1778-79 and participated in the Battle of Monmouth.  The regiment remained in the service of the Continental Army until late 1779 when redeployed Virginia.  Unlike the standard division of eight found in the regular line regiments of the Continental Army, the 1st Virginia State Regiment consisted of ten companies including one of light infantry.

Siege of Yorktown: The Siege of Yorktown, also known as the Battle of Yorktown, the Surrender at Yorktown, German Battle or the Siege of Little York, ending on October 19, 1781, at Yorktown, Virginia, was a decisive victory by a combined force of American Continental Army troops led by General George Washington and French Army troops led by the Comte de Rochambeau over a British Army commanded by British peer and Lieutenant General Charles Cornwallis.  The culmination of the Yorktown campaign, the siege proved to be the last major land battle of the American Revolutionary War in the North American theater, as the surrender by Cornwallis, and the capture of both him and his army, prompted the British government to negotiate an end to the conflict.  The battle boosted faltering American morale and revived French enthusiasm for the war, as well as undermining popular support for the conflict in Great Britain.

United States Army: The United States Army (USA) is the largest branch of the United States Armed Forces and performs land-based military operations.  It is one of the seven uniformed services of the United States and is designated as the Army of the United States in the United States Constitution, Article 2, Section 2, Clause 1 and United States Code, Title 10, Subtitle B, Chapter 301, Section 3001.  As the oldest and most senior branch of the U.S. military in order of precedence, the modern U.S. Army has its roots in the Continental Army, which was formed (14 June 1775) to fight the American Revolutionary War (1775–1783)—before the United States of America was established as a country.  After the Revolutionary War, the Congress of the Confederation created the United States Army on 3 June 1784 to replace the disbanded Continental Army.  The United States Army considers itself descended from the Continental Army, and dates its institutional inception from the origin of that armed force in 1775.

Benedict Arnold: Benedict Arnold (January 14, 1741 [O.S. January 3, 1740] June 14, 1801) was a general during the American Revolutionary War, who fought for the American Continental Army, and later defected to the British Army.  While a general on the American side, he obtained command of the fortifications at West Point, New York (which after 1802 would become the site of the U.S. Military Academy), overlooking the cliffs at the Hudson River (upriver from British-occupied New York City), and planned to surrender them to British forces.  This plan was exposed in September 1780.  He was commissioned into the British Army as a brigadier general.

Peggy Shippen: Margaret "Peggy" Shippen (July 11, 1760 – August 24, 1804) was the second wife of General Benedict Arnold.  Shippen garnered notoriety for being the highest-paid spy in the American Revolution.

Supporting paragraphs: Peggy Shippen Benedict Arnold
Answer: Benedict Arnold