Thus the "secret advice of a confessor" was won from Luther and Melanchthon (on 10 December 1539), neither of them knowing that the bigamous wife had already been chosen. Bucer and Melanchthon were now summoned, without any reason given, to appear in Rotenburg an der Fulda, where, on 4 March 1540, Philip and Margarethe were united. The time was particularly inauspicious for any scandal affecting the Protestants, for the Emperor, who had rejected the Frankfort Respite, was about to invade Germany. A few weeks later, however, the whole matter was revealed by Philip's sister Elisabeth, and the scandal caused a painful reaction throughout Germany. Some of Philip's allies refused to serve under him, and Luther, under the plea that it was a matter of advice given in the confessional, refused to acknowledge his part in the marriage.