The Thirty Years' War[j] was one of the longest and most destructive conflicts in European history, lasting from 1618 to 1648. Fought primarily in Central Europe, an estimated 4.5 to 8 million soldiers and civilians died as a result of battle, famine, or disease, while parts of modern Germany reported population declines of over 50%.[19] Related conflicts include the Eighty Years' War, the War of the Mantuan Succession, the Franco-Spanish War, the Torstenson War, the Dutch-Portuguese War, and the Portuguese Restoration War. The war was traditionally viewed as a continuation of the religious conflict initiated by the 16th-century Reformation within the Holy Roman Empire. The 1555 Peace of Augsburg attempted to resolve this by dividing the Empire into Catholic and Lutheran states, but over the next 50 years the expansion of Protestantism beyond these boundaries destabilised the settlement. However, while differences over religion and Imperial authority were important factors in causing the war, most modern commentators suggest its scope and extent were driven by the contest for European dominance between Habsburg-ruled Spain and Austria, and the French House of Bourbon.[20] Its outbreak is generally traced to 1618,[k] when Emperor Ferdinand II was deposed as king of Bohemia and replaced by the Protestant Frederick V of the Palatinate. Although Imperial forces quickly suppressed the Bohemian Revolt, his participation expanded the fighting into the Palatinate, whose strategic importance drew in the Dutch Republic and Spain, then engaged in the Eighty Years' War. Rulers like Christian IV of Denmark and Gustavus Adolphus of Sweden also held territories within the Empire, giving them and other foreign powers an excuse to intervene. The result was to turn an internal dynastic dispute into a broader European conflict. The first phase from 1618 until 1635 was primarily a civil war between German members of the Holy Roman Empire, with support from external powers. After 1635, the Empire became one theatre in a wider struggle between France, supported by Sweden, and Emperor Ferdinand III, allied with Spain. This concluded with the 1648 Peace of Westphalia, whose provisions included greater autonomy within the Empire for states like Bavaria and Saxony, as well as acceptance of Dutch independence by Spain. The conflict shifted the balance of power in favour of France, and set the stage for the expansionist wars of Louis XIV which dominated Europe for the next sixty years. Disputes occasionally resulted in full-scale conflict like the 1583 to 1588 Cologne War, caused when its ruler converted to Calvinism. More common were events such as the 1606 'Battle of the Flags' in Donauwörth, when riots broke out after the Lutheran majority blocked a Catholic religious procession. Emperor Rudolf approved intervention by the Catholic Maximilian of Bavaria. In return, he was allowed to annex the town, and as agreed at Augsburg, the official religion changed from Lutheran to Catholic.[29] When the Imperial Diet opened in February 1608, both Lutherans and Calvinists sought formal re-confirmation of the Augsburg settlement. In return, the Habsburg heir Archduke Ferdinand required the immediate restoration of all property taken from the Catholic Church since 1555, rather than the previous practice whereby the court ruled case by case. This demand threatened all Protestants, paralysed the Diet, and removed the perception of Imperial neutrality. Loss of faith in central authority meant towns and rulers began strengthening their fortifications and armies; outside travellers often commented on the growing militarisation of Germany in this period.[31] In 1608, Frederick IV, Elector Palatine formed the Protestant Union, and Maximilian responded by setting up the Catholic League in July 1609. Both were created to support the dynastic ambitions of their leaders, but combined with the 1609 to 1614 War of the Jülich Succession, the result was to increase tensions throughout the Empire.[32] Some historians who see the war as primarily a European conflict argue Jülich marks its beginning, with Spain and Austria backing the Catholic candidate, France and the Dutch Republic the Protestant.[33] The Spanish Road Purple: Spanish dependencies Green: Ruled by Austria Brown: Ruled by Spain External powers became involved in what was an internal German dispute due to the imminent expiry of the 1609 Twelve Years' Truce, which suspended the Eighty Years' War between Spain and the Dutch Republic. Before restarting hostilities, Ambrosio Spinola, commander in the Spanish Netherlands, needed to secure the Spanish Road, an overland route connecting Habsburg possessions in Italy to Flanders. This allowed him to move troops and supplies by road, rather than sea where the Dutch navy was dominant; by 1618, the only part not controlled by Spain ran through. It starts when Bohemian Revolts came.

• published: 13 Mar 2024
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