At the onset of the War of the Second Coalition in 1799, when the armies of the Danube and Helvetia were formed, he was assigned to the Army of the Danube under command of Jean Baptiste Jourdan. His 10th Regiment was part of Laurent de Gouvion Saint-Cyr's III. Division, and held the far left flank at the Battle of Ostrach, 21 March 1799, in southwestern Germany. Although he was wounded on 14 August 1799 in Switzerland, he participated in the Second Battle of Zurich in which his 10th "Chasseurs à Cheval" routed a division of Russians, a decisive moment in the French victory. Ordener was promoted to colonel of the regiment in 1801 and on 29 August 1803, he was promoted to general of brigade.