The immediate reaction of the princes is not documented, but Luther did not hold back: he published his "Letter to the Princes of Saxony about the Rebellious Spirit" demanding the radical's banishment from Saxony. However, the princes simply summoned all the relevant persons of Allstedt, Müntzer included, to a hearing at Weimar where, after being interrogated separately, they were warned about their future conduct. This hearing had the desired effect upon town officials, who back-pedalled rapidly and withdrew their support for the radicals. In the night of 7 August 1524, Müntzer slipped out of Allstedt (by necessity abandoning wife and son, who were only later able to join him), and headed for the self-ruling Imperial Free City of Mühlhausen, around to the southwest.