Nordmann's brigade fought at the Battle of Neumarkt-Sankt Veit on 24 April. During the subsequent retreat, he again led an independent force. During the Battle of Ebelsberg on 3 May, he covered Hiller's south flank near Lambach and Steyr with 3,000 troops. Later he marched straight for Vienna and, together with Joseph, Baron von Mesko de Felsö-Kubiny commanded four battalions and five squadrons in the brief defense of Vienna. On 12 May, the bulk of Vienna's defenders withdrew to the north bank of the Danube where Nordmann's force was left to observe the French.