In 1814 Chassé was transferred to the Champagne theatre of war where he joined the Division Boyer as commander of its 2nd Brigade. He fought in the battles of Bar-sur-Aube and Arcis-sur-Aube, where he was wounded. He directed the defense of Sens on 3 April 1814. However, after the fall of Paris and Napoleon's first abdication he had had enough and asked to be released from French service. This was granted with the rank of lieutenant-general on 6 October 1814.