The city council however, set itself up in opposition, recalled (1531) the Protestant preachers who had been expatriated, suppressed Catholic services in all churches except the cathedral (1534), and in 1537 joined the Schmalkaldic League.
Kuid linnavalitsus astus selle vastu, kutsus tagasi (1531) maapakku saadetud protestantlikud jutlustajad, surus alla katoliiklikud teenistused kõigis kirikutes peale toomkiriku (1534) ja ühines aastal 1537 Schmalkaldeni liiduga.