In 1809, Castlereagh dueled with George Canning, a former ally and colleague in the British government. The duel was fought in a field near Putney Heath, and Canning was wounded in the thigh. The duel was widely seen as a political act, and it damaged Castlereagh's reputation.
The Castlereagh Chronicles: Unraveling the Legacy of Robert Stewart, Viscount Castlereagh