During the Thirty Years' War Pfullingen was, from 1635 to 1648 with short interruptions, the administrative headquarters of Pfandherren (pledge lords) of Achalm and thus part of Further Austria. The Austrian manager resided in the castle. This was attacked by the commander of Württemberg fortress Hohentwiel, Konrad Widerholt, and was badly damaged. With the Peace of Westphalia Pfullingen returned to Württemberg. The monastery was vacated.