Rheinfeldt (Thirty Years' War).
Fought 1638, between the Protestant Germans, under Duke Bernard of Saxe Weimar, and the Imperialists, under Jean de Wert. The Duke was besieging Rheinfeldt, when he was attacked by de Wert, and forced to raise the siege and retire. After retreating, however, a short distance only, unpursued, he suddenly retraced his steps, and taking the Imperialists by surprise, inflicted upon them a severe defeat, dispersing their army and capturing de Wert. In this action fell the veteran Duc de Rohan.