 The wider war dragged on for another three years, with fighting in northern Italy and the Austrian Netherlands; however, the core Habsburg domains of Austria, Hungary and Bohemia remained in Maria Theresa's possession.The Treaty of Aachen, which concluded the eight-year conflict, recognised Prussia's possession of Silesia, and Maria Theresa ceded the Duchy of Parma to Philip of Spain.France had successfully conquered the Austrian Netherlands, but Louis XV, wishing to prevent potential future wars with Austria, returned them to Maria Theresa.