In mid-March 1814, Janssens collected 3,600 French soldiers from various garrisons and successfully marched through Allied-held territory to join Napoleon at Reims. At the Battle of Arcis-sur-Aube his division was assigned to the corps commanded by Marshal Michel Ney. On 21 March 1814 his division was embroiled in a terrific struggle for the village of Grand-Torcy during which he was wounded.