Excerpts from Books and Wikipedia
"But John Hus was not forgotten. At the news of his death, his followers in Bohemia had begun to gather weapons and organize themselves into groups: no longer simply followers of Wycliffe, they were now Hussites, an increasingly bold movement that was rapidly transforming into a popular army. . . . The new pope Martin V excommunicated all of Hus's followers early in 1418, forcing King Wenceslaus to act against them of be accused of defying the one true Church. . . But Wenceslaus had no more luck with the Hussites than with the imperial cities. His punishment led to a riot; in July of 1419, Hussites stormed through the streets of Prague, breaking into the town hall and demanding that the officials there release the imprisoned priests. In the scuffle that followed, Hussites threw thirteen Prague administrators out of the windows. Seven were killed in the street below." [This was called the 'First Defenestration of Prague.'] , , , The Hussite Wars would drag on for another twenty years: a bloody, extended, and explicit rejection of the authority of emperor, king, pope, and Church." [Bauer: Renaissance World, p. 618] "Although the war was a stalemate (ended around 1434), it was another factor between the Catholics and Protestants before the Protestant Reformation." [Wikipedia: Timeline of Middle Ages]