The Battle of Ladon and Mézières was a battle fought at Ladon and Mézières-en-Gâtinais between the French Army of the Loire led by Louis d'Aurelle de Paladines and Imperial German Army led by Prince Friedrich Karl of Prussia on November 17, 1870. During the battle the Prussians forced the French forces to retreat into the Bellegarde woods. Although the French army was quickly defeated in this battle, it showed the Prussians the substantial size of the French XX corps. the engagement showed the Germans that substantial forces of the French XX Corps were present on the battlefield. The defeat caused great damage to French morale. On November 17 the French attacked the Prussians again at the Battle of Beaune-la-Rolande, but they were defeated again.