temporal head of Christendom, they conferred no increase of power and financially embarrassed him. It was only as King of Hungary that he had succeeded in establishing his authority and in doing anything for the order and good government of the land. Entrusting the government of Bohemia to Sofia of Bavaria, the widow of Wenceslaus, he hastened into Hungary. The Bohemians, who distrusted him as the betrayer of Hus, were soon in arms; and the flame was fanned when Sigismund declared his intention of prosecuting the war against heretics. Three campaigns against the Hussites ended in disaster although the army of his most loyal ally Stibor of Stiboricz and later his son Stibor of Beckov could hold the Hussite side away from the borders of the Kingdom. The Turks were again attacking Hungary. At the 1422 Diet of Nuremberg, Sigismund and German territorial princes collaborated to organize two armies against the Hussite rebels. The first army was sent to relieve Karlštejn, which was under a Hussite siege; the second army was ordered to destroy the Hussite field army. But Jan Žižka defeated the Imperial force at the Battle of Kutná Hora and then at the Battle of Deutschbrod. These two unexpected defeats at the hands of the Hussites "ended the first Imperial and Catholic attempt to crush the Bohemian 'heretic rebellion'." The alliance against the Hussites continued to develop though, joined by Upper German princes and cities, even from "the regions furthest from Bohemia". In January 1424, associative activity of the German electors led to the Union ('einunge') of Bingen, "within which the Rhenish princes were joined by the duke of Saxony and Sigismund’s loyal partner Margrave Friedrich of Brandenburg, and mutual assistance, adjudication, and cooperation in the face of the Hussite threat were stipulated." Germany Sigismund's rule in Germany and in the Empire in general was hampered by his complete lack of Hausmacht (domestic power) within the Kingdom of Germany. His rule relied on key allies and the culture of associative political mechanisms in Germany. Duncan Hardy remarks that, "both the local and the trans-regional dimensions of the political activity displayed by the sources from throughout Sigismund’s reign demonstrate that power at every level in the Empire was exercised and mediated through the customary institutions and mechanisms of associative mediated through the customary institutions and mechanisms ofassociative political culture. If Sigismund enjoyed considerable successes at certain junctures, it was