The town refused to acknowledge Konrad's rule and did not want to pay its taxes any longer. That is why Konrad IX achieved the "Reichsacht" at the royal court imposing on all citizens of age on 10 February 1422. Since it had caused nothing the "Aberacht" followed in 1425. In addition the Pope – presumably Martin V – imposed the anathema on them in 1424. However, all this had not caused anything, and Konrad took drastic steps. Weakening the Swabian towns allied with Weinsberg, he acquired the town Sinsheim, where one of the arteries led to the Frankfurt Trade Fair. In August 1428 he attacked businessmen in Sinsheim travelling to the fair and detained 149 people from 20 cities, so the Frankfurt fair had to fail. The king took it as a personal offense and withdrew his favour from Konrad. In October 1428 the cities agreed with Konrad in Heidelberg, however the king forbade this agreement. Two years later, the parties reached an agreement on the basis of the obtained agreement two years before. According to the corresponding treaty Konrad had to recognize Weinsberg as a (undivided) free imperial city.