 In 1633, during the Thirty Years’ War, there was an engagement at the earthworks in which the Imperial Army's Spanish troops suffered a great onslaught from troops of the Union under command of Rhinegrave Otto, and were thereby forced to withdraw from the Palatinate, and the whole left bank of the Rhine.The Spaniards lost all their baggage in the ordeal, and perhaps worse, 1,500 mercenaries were taken prisoner.In 1635, Ulmet was burnt down by the Imperial Army's Croatian mercenaries.