The Battle of Les Avins or Battle of Avein was fought on May 20, 1635 during the Thirty Years' War between a French and a Spanish army. The battle was fought in the Belgian village of Les Avins, south of Huy, in what was then the bishopric of Liège. It was the first serious engagement for the French, which had entered the war only three months before. The French army was under command of Marshals of France Urbain de Maillé-Brézé and Gaspard III de Coligny, Maréchal de Châtillon. The Spanish were commanded by Thomas Francis, Prince of Carignano.