Arnold lived extravagantly in Philadelphia and was a prominent figure on the social scene. During the summer of 1778, he met Peggy Shippen, the 18-year-old daughter of Judge Edward Shippen (III), a Loyalist sympathizer who had done business with the British while they occupied the city; Peggy had been courted by British Major John André during the British occupation of Philadelphia. She married Arnold on 8 April 1779. Shippen and her circle of friends had found methods of staying in contact with paramours across the battle lines, despite military bans on communication with the enemy. Some of this communication was effected through the services of Joseph Stansbury, a Philadelphia merchant.