Arguably the first European wars in which hand-held gunpowder weapons played a decisive role, the Hussite Wars were a series of 15th-century conflicts that followed the execution of Czech religious reformer Jan Hus by the Roman Catholic Church. Protests from his followers, called Hussites, who opposed the ascension of Emperor Sigismund to the Bohemian throne, led to three anti-Hussite crusades and a number of armed conflicts. War broke out after what was thrown out of windows in Prague? Discuss