Arnold left for a business opportunity in 1784 and sent to Connecticut for his three sons Benedict, Richard, and Henry (by his first wife) to join him in Saint John, New Brunswick. During Arnold's stay in New Brunswick, Peggy Shippen Arnold gave birth to their third surviving child Sophia Matilda Arnold, while her husband may have fathered an illegitimate child (John Sage) in New Brunswick. Peggy sailed to Saint John to join her husband in 1787, leaving her two older sons with a private family in London; in New Brunswick, Peggy gave birth to son George in 1787; their last child William Fitch was born in 1794 after their return to London.