Task: Question Generation
Input (English): Passage: Papal influence had meanwhile succeeded in calling forth a new crusade against Bohemia, but it resulted in complete failure. In spite of the endeavours of their rulers, Poles and Lithuanians did not wish to attack the kindred Czechs; the Germans were prevented by internal discord from taking joint action against the Hussites; and the King of Denmark, who had landed in Germany with a large force intending to take part in the crusade, soon returned to his own country. Free for a time from foreign threat, the Hussites invaded Moravia, where a large part of the population favored their creed; but, paralysed again by dissensions, they soon returned to Bohemia. The city of Hradec Králové, which had been under Utraquist rule, espoused the doctrine of Tábor, and called Žižka to its aid. After several military successes gained by Žižka in 1423 and the following year, a treaty of peace between the Hussite factions was concluded on 13 September 1424 at Libeň, a village near Prague, now part of that city. Sigismund Korybut, who had returned to Bohemia in 1424 with 1,500 troops, helped broker this peace. After Žižka's death in October 1424, Prokop the Great took command of the Taborites. Korybut, who had come in defiance of Władysław II and Vytautas, also became a Hussite leader.
Output (English): How many people did Korybut come in defiance of?