The Hussite Wars, fought between 1419 and 1434 in Bohemia, had their origins in a conflict between Catholics and the followers of a religious sect founded by Jan Hus. The inciting action of the war was the First Defenestration of Prague, in which the mayor and the town council members of Prague were thrown from the windows of the town building. Emperor Sigismund, a firm adherent of the Roman Catholic Church, obtained the support of Pope Martin V who issued a papal bull in 1420 proclaiming a crusade. In all, four crusades were launched against the heretics, all resulting in defeat for the Catholic troops. The Hussites, capably led by Jan Žižka, employed novel tactics to defeat their numerically superior enemies, decisively at Aussig. Whenever a crusade would end, the Hussite armies go on "Beautiful Rides" and would invade the lands where the crusaders were from. One such place was Saxony. After Žižka's death in 1424, the Hussite armies were led by Prokop the Great to another victory at the Battle of Tachov in 1427. The Hussites repeatedly invaded central German lands, though they made no attempt at permanent occupation, and at one point made it all of the way to the Baltic Sea. The Hussite movement was ended in 1434, however, at the Battle of Lipany.