When the king returned, he told the queen that her son was dead. She replied: "What! Have you murdered your son?" When given the reply: "He was not my son, he was only a miserable deserter," she became hysterical and screamed repeatedly: "Mon Dieu, mon fils! mon Dieu, mon fils!" The king then started to beat Wilhelmine and would possibly have killed her. Her siblings and ladies-in-waiting intervened. Frederick's accomplice Katte arrived as a prisoner, so the king beat him instead. When Frederick was imprisoned at the fortress in Küstrin, Grumbkow acted as mediator between Frederick and his parents, managing to reconcile them.