Subsequently, Ordener took part in all the French Revolutionary Wars. In the War of the First Coalition, he served with distinction in the armies of the Moselle, the Rhine, the Danube and in northern Italy. He was promoted to lieutenant in the 10th Regiment "Chasseurs à Cheval" (light horse) on 25 January 1792 and captain the following year. In 1796 he was promoted to "chef de brigade" of the 10th Regiment. At the Battle of Lodi, in northern Italy, despite the ravaging fire of Austrian cannons, Ordener held the famous bridge until the arrival of Napoleon with the rest of the army. Ordener crossed the Adda river with a brigade to encircle and envelope the Austrians at the Battle of Pavia. Afterward, he helped to take Milan.