In the 1800 campaign in southern Germany, Riesch again led a cavalry division under Pál Kray at the Second Battle of Stockach on 3 May and at the Battle of Messkirch two days later. A string of Austrian defeats ended in an armistice that summer. In the interim, the emperor appointed the youthful Archduke John of Austria to lead the army. A cavalry specialist, Riesch found himself in command of a corps containing infantry, cavalry, and artillery. When the armistice lapsed in November, both armies rapidly moved into contact. Riesch and Ludwig Baillet de Latour led their commands against the French divisions of Michel Ney and Jean Hardÿ in the Battle of Ampfing on 1 December. The Austrians succeeded in driving their enemies back in bitter fighting, but paid for the victory with 3,100 casualties.