The Hussite Wars, also called the Bohemian Wars or the Hussite Revolution, were a series of civil wars fought between the Hussites and the combined Catholic forces of Holy Roman Emperor Sigismund, the Papacy, and European monarchs loyal to the Roman Catholic Church, as well as various Hussite factions. At a late stage of the conflict, the Utraquists changed sides in 1432 to fight alongside Roman Catholics and opposed the Taborites and other Hussite factions. These wars lasted from 1419 to approximately 1434.
The unrest began after proto-Protestant Christian reformer Jan Hus was executed by the Catholic Church in 1415 for heresy. Because Sigismund had plans to be crowned the Holy Roman Emperor (requiring papal coronation), he suppressed the religion of the Hussites, yet it continued to spread. When King Wenceslaus IV of Bohemia, brother of Sigismund, died of natural causes a few years later, the tension stemming from the Hussites grew stronger. In Prague and various other parts of Bohemia, the Catholic Germans living there were forced out.
Wenceslaus's brother, Sigismund, who had inherited the throne, was outraged by the spread of Hussitism. He received permission from the pope to launch a crusade against the Hussites, and large numbers of crusaders came from all over Europe to fight; they made early advances, forcing the Hussites back and taking Prague. However, the Hussites reorganized and took back nearly all the land they had lost, resulting in the failure of the crusade.
After the reins of the Hussite army were handed over to yeoman Jan Žižka, internal strife followed. Seeing that the Hussites were weakened, the Germans undertook another crusade but were defeated by Žižka at the Battle of Německý Brod. Three more crusades were attempted by the papacy, but none achieved their objectives. The Lithuanians and Poles did not wish to attack the Czechs, Germany was having internal conflicts and could not muster up a sufficient force to battle the Hussites, and the king of Denmark left the Czech border to go back to his home. As the conflicts went on, the Hussites also made raids into German territory.
The wars eventually ended in 1434 when the moderate Utraquist faction of the Hussites defeated the radical Taborite faction. The Hussites agreed to submit to the authority of the king of Bohemia and the Roman Catholic Church and were allowed to practice their somewhat variant rite.
The Hussite community included much of the Czech population of the Kingdom of Bohemia and formed a major spontaneous military power. The Hussite Wars were notable for the extensive use of early handheld firearms such as hand cannons and of wagon forts by the Hussites.
Starting around 1402, priest and scholar Jan Hus denounced what he judged as the corruption of the church and the papacy, and he promoted some of the reformist ideas of English theologian John Wycliffe. His preaching was widely heeded in Bohemia, and provoked suppression by the church, which had declared many of Wycliffe's ideas heretical. In 1411, in the course of the Western Schism, "Antipope" John XXIII proclaimed a "crusade" against King Ladislaus of Naples, the protector of rival Pope Gregory XII. To raise money for this, he proclaimed indulgences in Bohemia. Hus bitterly denounced this and explicitly quoted Wycliffe against it, provoking further complaints of heresy but winning much support in Bohemia.
In 1414, Sigismund of Hungary convened the Council of Constance to end the Schism and resolve other religious controversies. Hus went to the Council, under a safe-conduct from Sigismund, but was imprisoned, tried, and executed on 6 July 1415. The knights and nobles of Bohemia and Moravia, who were in favour of church reform, sent the protestatio Bohemorum to the Council of Constance on 2 September 1415, which condemned the execution of Hus in the strongest language. This angered Sigismund, who was "King of the Romans" (head of the Holy Roman Empire, though not yet Emperor) and brother of King Wenceslaus of Bohemia. He had been persuaded by the Council that Hus was a heretic. He sent threatening letters to Bohemia declaring that he would shortly drown all Wycliffites and Hussites, greatly incensing the people.
Disorder broke out in various parts of Bohemia and drove many Catholic priests from their parishes. Almost from the beginning, the Hussites were divided into two main groups, though many minor divisions also arose among them. Shortly before his death, Hus had accepted the doctrine of Utraquism preached during his absence by his adherents at Prague: the obligation of the faithful to receive communion in both kinds, bread and wine (sub utraque specie). This doctrine became the watchword of the moderate Hussites known as the Utraquists or Calixtines, from the Latin calix (the chalice), in Czech Kališníci (from kalich). The more extreme Hussites became known as Taborites (Táborité), after the town of Tábor, which became their centre; or Orphans (Sirotci), a name they adopted after the death of their leader and general Jan Žižka.
Under the influence of Sigismund, Wenceslaus endeavoured to stem the Hussite movement. A number of Hussites led by Mikuláš of Hus left Prague. They held meetings in various parts of Bohemia, particularly at Sezimovo Ústí, near the spot where the town of Tábor was founded soon afterwards. At these meetings, they violently denounced Sigismund, and the people everywhere prepared for war.
In spite of the departure of many prominent Hussites, the troubles at Prague continued. On 30 July 1419, a Hussite procession headed by the priest Jan Želivský attacked New Town Hall in Prague and threw the king's representatives, the burgomaster, and some town councillors from the windows into the street (the first "Defenestration of Prague"), where several were killed by the fall, after a rock was allegedly thrown from the town hall and hit Želivský. It has been suggested that Wenceslaus was so stunned by the defenestration that it caused his death on 16 August 1419. Alternatively, it is possible that he may have just died of natural causes.
The death of Wenceslaus resulted in renewed troubles in Prague and in almost all parts of Bohemia. Many Catholics, mostly Germans—mostly still faithful to the Pope—were expelled from the Bohemian cities. Wenceslaus's widow Sophia of Bavaria, acting as regent in Bohemia, hurriedly collected a force of mercenaries and tried to gain control of Prague, which led to severe fighting. After a considerable part of the city had been damaged or destroyed, the parties declared a truce on 13 November. The nobles, sympathetic to the Hussite cause, but supporting the regent, promised to act as mediators with Sigismund, while the citizens of Prague consented to restore to the royal forces the castle of Vyšehrad, which had fallen into their hands. Žižka, who disapproved of this compromise, left Prague and retired to Plzeň. Unable to maintain himself there he marched to southern Bohemia. He defeated the Catholics at the Battle of Sudoměř (25 March 1420), the first pitched battle of the Hussite Wars. After Sudoměř, he moved to Ústí, one of the earliest meeting places of the Hussites. Not considering its situation sufficiently strong, he moved to the neighboring new settlement of the Hussites, called by the biblical name of Tábor.
Tábor soon became the center of the most militant Hussites, who differed from the Utraquists by recognizing only two sacraments—Baptism and Communion—and by rejecting most of the ceremony of the Roman Catholic Church. The ecclesiastical organization of Tabor had a somewhat puritanical character, and the government was established on a thoroughly democratic basis. Four captains of the people (hejtmané) were elected, one of whom was Žižka, and a very strict military discipline was instituted.
Use of war wagons and firearms
Late 14th and early 15th century saw gradually increasing use of firearms in siege operations both by defenders and attackers. Weight, lack of accuracy and cumbersome use of early types limited their employment to static operations and prevented wider use in open battlefield or by civilian individuals. Nevertheless, lack of guild monopolies and low training requirements led to their relatively low price. This together with high effectiveness against armour led to their popularity for castle and town defenses.