The Battle of Dahlen was fought on April 23, 1568, between a Dutch rebel army led by Jean de Montigny, Lord of Villers, and a Spanish army commanded by Sancho Dávila y Daza. As a part of William of Orange's planned invasion, the Dutch rebels were trying to conquer the town of Roermond when the arrival of the Spanish force compelled them to withdraw. Dávila pursued the retreating force and inflicted a defeat upon Villers near the small town of Dahlen (today known as Rheindahlen). The survivors of this encounter sought refuge under the walls of Dahlen, where the Spanish infantry finally defeated them. This battle is sometimes considered the official start of the Eighty Years' War.