In 1813, he suffered the disruptions of the Napoleonic Wars: his work was ruined by the French under Vandamme, who destroyed his books, writings and observatory.
1813年，他惨遭了拿破仑战争的破坏：多米尼克·旺达姆(Vandamme)率领的法军毁坏他的工作，毁掉了他的书籍、著作和天文台。