Early modern period
End of the Crusades and Unity

The Hussite Crusades (1419–1434) involved military actions against the followers of Jan Hus in Bohemia, concluding with the Battle of Grotniki. These wars were notable for being among the first European conflicts where hand-held gunpowder weapons, like muskets, played a decisive role. The Taborite faction of Hussite warriors, primarily infantry, decisively defeated larger armies with heavily armored knights, contributing to the infantry revolution. However, the Hussite Crusades were ultimately inconclusive.

The final crusade, the Crusade of 1456, was organized to counter the advancing Ottoman Empire and lift the Siege of Belgrade (1456), led by John Hunyadi and Giovanni da Capistrano. The siege culminated in a counterattack that forced Sultan Mehmet II to retreat, with the victory being credited with deciding the fate of Christendom. The noon bell, ordered by Pope Callixtus III, commemorates this victory across the Christian world to this day.

Nearly a century later, the Peace of Augsburg (1555) ended the concept of a united Christian church. The principle of cuius regio, eius religio allowed rulers to determine their state's religion. This framework was solidified by the Treaty of Westphalia (1648), which ended the European Wars of Religion and the notion of a singular Christian hegemony. The treaty also marked the birth of the modern concept of national sovereignty.
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