In 1805 the 2nd Dragoon Regiment was made part of the 1st Dragoon Division (commanded by General of Division Louis Klein) of Marshal Joachim Murat's Reserve Cavalry Corps in the Grande Armée of Napoleon I. The First Empire gave them scarlet as their distinguishing colour on their facings and coat lapels, which they shared with the 1st through 6th Dragoons. In the autumn of 1805, the regiment and the rest of Klein's division was part of the remarkably successful Ulm Campaign, fighting at the battles of Wertingen and Albeck on 8 and 11 October, at the Battle of Ulm a week later, and at the Battle of Austerlitz on 20 November.