Austria did not return to active war against France until the Danube Campaign of 1809. Although the Habsburgs eked out a victory at Aspern and Essling, the campaign resulted in yet another decisive defeat at Wagram. In this campaign, the prince saw no active service, although for nine months in 1809, he served as "Adlatus" (noble adjutant and mentor) of the Commanding General in Galicia. In December, he retired to his estates in Hungary, where he died on 16 June 1815 in Kaschau, today Košice, in Slovakia.