During the initial phase of the campaign, Nansouty's division was at first attached to Marshal Louis Nicolas Davout's III Corps, with which it crossed the Rhine and then the Danube, before rejoining Murat's cavalry reserve. Nansouty had a first opportunity to lead his men into combat at the Battle of Wertingen, where his men were noted for their excellent manoeuvring. Detaching his two "Carabiniers-à-Cheval" regiments, which he had to leave with Murat, Nansouty and his reduced division followed the Emperor at Augsburg, where he was attached to Marshal Jean Lannes's V Corps. In this capacity, they supported Walther's division at the Battle of Schöngrabern. Then, at the Battle of Wischau on 25 November 1805, the 9th Cuirassiers participated in a major cavalry action, alongside d'Hautpoul's cuirassier division, Walther's dragoons and Bessières's "Grenadiers à Cheval" and "Chasseurs à Cheval" of the Guard cavalry.