On 21 June 1813 at the Battle of Vitoria, Trelliard commanded the 1,038 horsemen in his four French dragoon regiments as part of the Army of the Center. After Marshal Nicolas Soult reorganized the army in the late summer of 1813, he led a 2,358-strong cavalry division consisting of six regiments. During the Battle of the Pyrenees at the end of July, the division included the 4th, 14th, 16th, 17th, 21st, and 26th Dragoon Regiments. At the Battle of the Nive on 10 December 1813, Louis-Ernest-Joseph Sparre's dragoon brigade of his division overran the 1st Portuguese Line Infantry Regiment. Trelliard and his division were transferred to eastern France shortly after the battle.