On 9 June 1547 Count Albrecht von Mansfeld, commander of the Protestant forces in the Smalkaldic War, captured the fortress. By this time the inhabitants adopted Lutheranism, also as a form of opposition against the spendthrift Prince-Archbishop Christopher, who broke contracts with the estates of the prince-archbishopric and acted against its constitution.
In June 1547, Count Albrecht von Mansfeld, leader of the Protestant forces in the Smalkaldic War, captured the stronghold. At that time, the local population had adopted Lutheranism as a means of protest against the profligate Prince-Archbishop Christopher, who had breached his contracts with the estates and disregarded the constitution.