He formed an alliance with Spain and continued to press for his independence from France when Henry IV became King of France. Henry IV of France sent a force against him led by the duc de Montpensier. With the aid of the Spaniards he defeated the French at the Battle of Craon in 1592. However, the royal troops were reinforced by English contingents and soon recovered the advantage. The king marched against Mercœur in person, and received his submission at Angers on 20 March 1598.