After the Council of Constance put their leader, Jan Hus, to death on 6 July 1415, the same year in which the Council had declared itself superior to the Pope, the Hussites fought a series of wars (1420-1434) for their religious and political cause.
Among present-day Christians, its traditions are represented in churches which call themselves Moravian or Unity of the Brethren churches, and in the refounded Czechoslovak Hussite Church.
The arrest of Hus in 1414 caused considerable resentment in Czech lands. The authorities of both countries appealed urgently and repeatedly to Emperor Sigismund, to release Jan Hus.
When news of his death at the Council of Constance in 1415 arrived, disturbances broke out, directed primarily against the clergy, and especially against the monks. Even the Archbishop narrowly escaped from the effects of this popular anger. The treatment of Hus was felt to be a disgrace inflicted upon the whole country, and his death was seen as a criminal act. King Wenceslaus, prompted by his grudge against Sigismund, at first gave free vent to his indignation at the course of events in Constance; and his wife openly favored the friends of Hus. Avowed Hussites stood at the head of the government.
A league was formed by certain lords, who pledged themselves to protect the free preaching of the Gospel upon all their possessions and estates, and to obey the power of the Bishops only where their orders accorded with the injunctions of the Bible, with the university as arbiter of any disputed points. The entire Hussite nobility joined the league. If the king had joined, its resolutions would have received the sanction of the law; but he refused, and approached the newly formed Roman Catholic League of lords, whose members pledged themselves to support the king, the Roman Church, and the Council. The prospect of a civil war began to emerge.
Pope Martin V, who while still Cardinal Otto of Colonna, had attacked Hus with relentless severity, energetically resumed the battle against Hus's teaching after the enactments of the Council of Constance, seeking to eradicate completely the doctrine of Hus. For this purpose, the co-operation of King Wenceslaus had to be obtained. In 1418, Sigismund succeeded in winning his brother over to the standpoint of the council by pointing out the inevitability of a religious war if the heretics in Bohemia found further protection. Hussite statesmen and army leaders had to leave the country, and Roman Catholic priests were reinstated. These measures caused a general commotion which hastened the death of King Wenceslaus by a paralytic stroke in 1419. His heir was Sigismund.
The moderate party, who followed Hus more closely, sought to conduct reform while leaving the whole hierarchical and liturgical order of the Church untouched.
The more radical party identified itself more boldly with the doctrines of John Wyclif, sharing his passionate hatred of the monastic clergy, and his desire to return the Church to its supposed condition during the time of the apostles. This required the removal of the existing hierarchy and the secularization of ecclesiastical possessions. The radicals preached the "sufficientia legis Christi"—the divine law (i.e. the Bible) is the sole rule and canon for human society, not only in the church, but also in political and civil matters. They rejected therefore, as early as 1416, everything that they believed had no basis in the Bible, such as the veneration of saints and images, fasts, superfluous holidays, the oath, intercession for the dead, auricular Confession, indulgences, the sacraments of Confirmation and the Anointing of the Sick; they admitted laymen and women to the preacher's office, and chose their own priests. But above all they clung to Wyclif's doctrine of the Lord's Supper, denying transubstantiation, and this is the principal point by which they are distinguished from the moderate party.
The radicals had their gathering-places all around the country. Their first armed assault fell on the small town of Ústí, on the river Luznice, south of Prague (today's Sezimovo Ústí). However, as the place did not prove to be defensible, they settled the remains of an older town upon a hill not far away and founded a new town, which they named Tábor (after the traditional name of the mountain on which Jesus was expected to return; see Mark 13); hence they were called Taborites. They comprised the essential force of the radical Hussites. Their aim was to destroy the enemies of the law of God, and to defend his kingdom (which had been expected to come in a short time) by the sword. Their end-of-world visions did not come true. In order to preserve their settlement and spread their ideology, they waged bloody wars; in the beginning they observed a strict regime, inflicting the severest punishment equally for murder, as for less severe faults as adultery, perjury and usury, and also tried to apply rigid Biblical standards to the social order of the time. The Taborites usually had the support of the Orebites (later called Orphans), an eastern Bohemian sect of Hussitism based in Hradec Králové.
The Hussites initially campaigned defensively, but after 1427 they assumed the offensive. Apart from their religious aims, they fought for the national interests of the Czechs. The moderate and radical parties were united and they not only repelled the attacks of the army of crusaders, but crossed the borders into neighboring countries. On March 23, 1430, Joan of Arc dictated a letter that threatened to lead a crusading army against the Hussites unless they returned to the Catholic faith, but her capture by English and Burgundian troops two months later would keep her from carrying out this threat.
The Taborites refused to conform. The Calixtines united with the Roman Catholics and destroyed the Taborites at the Battle of Lipany on (30 May 1434). From that time, the Taborites lost their importance, though the Hussite movement would continue in Poland for another five years, until the Royalist forces of Poland defeated the Polish Hussites at the Battle of Grotniki. The state assembly of Jihlava in 1436 confirmed the "Compacta" and gave them the sanction of law. This accomplished the reconciliation of Bohemia with Rome and the Western Church, and at last Sigismund obtained possession of the Bohemian crown. His reactionary measures caused a ferment in the whole country, but he died in 1437. The state assembly in Prague rejected Wyclif's doctrine of the Lord's Supper, which was obnoxious to the Utraquists, as heresy in 1444. Most of the Taborites now went over to the party of the Utraquists; the rest joined the "Brothers of the Law of Christ" ("Unitas Fratrum") (see Unity of the Brethren; also Bohemian Brethren and Moravian Church).
Under Emperor Maximilian II, the Bohemian state assembly established the "Confessio Bohemica," upon which Lutherans, Reformed, and Bohemian Brethren agreed. From that time forward Hussism began to die out. After the Battle of White Mountain on 8 November 1620 the Roman Catholic Faith was re-established with vigour which fundamentally changed the religious conditions of Bohemia and Moravia.
Leaders and members of Unitas Fratrum were forced to choose to either leave the many and varied southeastern principalities of what was the Holy Roman Empire (mainly Austria, Hungary, Bohemia, Moravia and parts of Germany and its many states), or to practice their beliefs secretly. As a result, members were forced underground and dispersed across northwestern Europe. The largest remaining communities of the Brethren were located in Lissa in Poland, which had historically strong ties with the Czechs, and in small, isolated groups in Moravia. Some, among them Jan Amos Comenius, fled to western Europe, mainly the Low Countries. A settlement of hussites in Herrnhut, Germany, in 1727 caused the emergence of the Moravian Church.
Today, the Czechoslovak Hussite Church claims to be the modern successor of the Hussite tradition.