Thirty Years' War
The Thirty Years' War was a conflict primarily fought in Central Europe from 1618 to 1648; estimates of total military and civilian deaths range from 4.5 to 8 million, mostly from disease or starvation. In some areas of Germany, it has been suggested up to 60% of the population died.
Until the mid-20th century, it was seen as predominantly a German civil war and considered one of the European wars of religion. In 1938, C. V. Wedgwood argued it formed part of a wider European conflict, whose underlying cause was the ongoing contest between Austro-Spanish Habsburgs and French Bourbons. This view is now generally accepted by historians. Related conflicts include the Eighty Years War, the War of the Mantuan Succession, the Franco-Spanish War, and Portuguese Restoration War.
The conflict can be split into two main parts. The first period from 1618 to 1635 was a struggle within the Holy Roman Empire, fought between Emperor Ferdinand II and his internal opponents, with external powers playing a supportive role. Despite the parties agreeing the Peace of Prague in 1635, fighting continued with Sweden and France on one side, the Spanish and Austrian Habsburgs on the other. This second phase ended with the 1648 Peace of Westphalia.
The war originated in differences between German Protestants and Catholics, which were temporarily settled by the 1555 Peace of Augsburg but gradually undermined by political and religious tensions. In 1618, the Bohemian Estates deposed the Catholic Ferdinand II as King of Bohemia; they offered the Crown to the Protestant Frederick V of the Palatinate, who accepted. Regardless of religion, most German princes refused to support him and by early 1620 the Bohemian Revolt had been suppressed.
When Frederick refused to admit defeat, the war expanded into the Palatinate, whose strategic importance drew in external powers, notably the Dutch Republic and Spain. By 1623, Spanish-Imperial forces controlled the Palatinate; backed by the Catholic League, Ferdinand stripped Frederick of his possessions and sent him into exile. This threatened other Protestant rulers within the Empire, including Christian IV of Denmark, who was also Duke of Holstein. In 1625, he intervened in Northern Germany but withdrew in 1629 after a series of defeats.
Bolstered by this success, Ferdinand passed the Edict of Restitution, which undermined territorial rights across large areas of North and Central Germany. This provided an opportunity for Gustavus Adolphus of Sweden, who invaded the Empire in 1630; backed by French subsidies, the Swedes and their German allies won a series of victories over Imperial forces, although Gustavus was killed in 1632. In 1635, Ferdinand made peace with his German opponents by accepting their autonomy; in return, they dissolved the Heilbronn and Catholic Leagues.
The defection of their German allies led France to join the war directly, which continued until Westphalia in 1648. Its main provisions included Spanish confirmation of Dutch independence, and acceptance of "German liberties" by the Austrian Habsburgs. By weakening the Habsburgs while increasing the status of France and Sweden, it led to a new balance of power on the continent.
The 1555 Peace of Augsburg was intended to end conflict between German Protestants and Catholics by establishing the principle of cuius regio, eius religio. This meant each of the 224 member states was either Lutheran, the most usual form of Protestantism, or Catholic, based on the choice made by their ruler. In addition, Lutherans could keep lands or property taken from the Catholic Church since the 1552 Peace of Passau. However, it was a compromise that failed to resolve underlying religious and political tensions within the Holy Roman Empire.
After 1560, the Protestant cause was deeply divided by the growth of Calvinism, a Reformed faith not recognised by Augsburg; Lutheran states like Saxony viewed Calvinists in the Palatinate and Brandenburg with mistrust, paralysing Imperial institutions. In addition, rulers might share the same religion but have different economic and strategic objectives; for much of the war, the Papacy supported France against the Habsburgs. The chief agents of the Counter-Reformation were similarly split, the Jesuits generally backing Austria, the Capuchins France.
Managing these issues was complicated by the fragmented nature of the Empire, a patchwork of nearly 1,800 separate entities in Germany, the Low Countries, Northern Italy, and areas like Alsace, now part of modern France. They ranged in size and importance from the seven Prince-electors who voted for the Holy Roman Emperor, down to Prince-bishoprics and City-states, such as Hamburg. Each member was represented in the Imperial Diet; prior to 1663, this assembled on an irregular basis, and was primarily a forum for discussion, rather than legislation.
While Emperors were elected, since 1440 this had been a Habsburg, the largest single landowner within the Empire; their lands included the Archduchy of Austria, the Kingdom of Bohemia, and the Kingdom of Hungary, with over eight million subjects. In 1556, Habsburg Spain became a separate entity, while retaining Imperial states such as the Duchy of Milan, and interests in Bohemia and Hungary; the two often co-operated, but their objectives did not always align. Then the predominant global power, the Spanish Empire included the Spanish Netherlands, much of Italy, the Philippines, and most of the Americas, while Austria remained focused on Central Europe.
Before Augsburg, unity of religion compensated for lack of strong central authority; once removed, it presented opportunities for those who sought to further weaken it. This included ambitious Imperial states like Lutheran Saxony and Catholic Bavaria, as well as France, which faced Habsburg territories on its borders in Flanders, Franche-Comté, and the Pyrenees. Disputes within the Empire drew in outside powers, many of whom held Imperial territories, including the Dutch Prince of Orange, hereditary ruler of Nassau-Dillenburg. Christian IV of Denmark was also Duke of Holstein, and it was in this capacity he joined the war in 1625.
Background; 1556 to 1618
These tensions gradually undermined Augsburg, and paralysed institutions like the Imperial diet designed to resolve them peacefully. Occasionally it meant full-scale conflict, such as the 1583 to 1588 Cologne War, caused by the conversion to Calvinism of the Prince Elector, Gebhard Truchsess von Waldburg. More common were disputes such as the 1606 'battle of the flags' in Donauwörth, when the Lutheran majority blocked a Catholic religious procession. Emperor Rudolf approved intervention by the Catholic Maximilian of Bavaria on their behalf; he was allowed to annex Donauwörth to recover his costs, turning a Lutheran town Catholic.
As a result, when the Imperial Diet opened in February 1608, the Protestants demanded formal confirmation of the Augsburg settlement, which was especially significant for Calvinists like Frederick IV, Elector Palatine who had not been included. The Habsburg Archduke Ferdinand first required the return of all property taken from the Catholic church since 1552, rather than leaving the courts to decide case by case as previously. This threatened both Lutherans and Calvinists, paralysed the Diet and removed the perception of Imperial neutrality.
One outcome was the formation of the Protestant Union, led by Frederick IV and largely composed of states in Southern Germany, to which Maximilian responded by setting up the Catholic League in July 1609. While both were primarily designed to support the dynastic ambitions of their leaders, they combined with events like the 1609 to 1614 War of the Jülich Succession to increase tensions throughout the Empire. Some historians who view the war primarily as an international conflict argue this marks the beginning of the conflict, since Spain and Austria backed the Catholic candidate, France and the Dutch Republic the Protestant.
In 1609, the Twelve Years' Truce suspended the war between Spain and the Dutch, which was due to expire in 1621. Ambrosio Spinola, commander in the Spanish Netherlands, was preparing to restart hostilities, which required securing the Spanish Road. An overland route connecting Habsburg possessions in Italy to Flanders, it allowed him to move troops and supplies by road, rather than sea where the Dutch navy held the advantage. This was the reason behind Spanish involvement in the Jülich dispute; by 1618, the only part not controlled by Spain ran through the Electoral Palatinate.
Since Emperor Matthias had no surviving children, in July 1617 Philip III of Spain agreed to support Ferdinand's election as king of Bohemia and Hungary. In return, Ferdinand made concessions to Spain in Northern Italy and Alsace, and agreed to support their offensive against the Dutch. Delivering these commitments required his election as Emperor, which was not guaranteed; one alternative was Maximilian of Bavaria, who opposed the increase of Spanish influence in an area he considered his own, and tried to create a coalition with Saxony and the Palatinate to support his candidacy.
Another was Frederick V, Elector Palatine, who succeeded his father in 1610, and in 1613 married Elizabeth Stuart, daughter of James I of England. Four of the electors were Catholic, three Protestant; if this could be changed, it might result in a Protestant Emperor. When Ferdinand was elected king of Bohemia in 1617, he gained control of its electoral vote; however, his conservative Catholicism made him unpopular with the largely Protestant Bohemian nobility, who were also concerned at the erosion of their rights. In May 1618, these factors combined to bring about the Bohemian Revolt.
Phase I: 1618 to 1635
The Bohemian Revolt
The Jesuit educated Ferdinand once claimed he would rather see his lands destroyed than tolerate heresy for a single day. Appointed to rule the Duchy of Styria in 1595, within eighteen months he eliminated Protestantism in what was previously a stronghold of the Reformation. Focused on retaking the Netherlands, the Spanish Habsburgs preferred to avoid antagonising Protestants elsewhere, and recognised the dangers associated with Ferdinand's fervent Catholicism, but accepted the lack of alternatives.
Ferdinand reconfirmed Protestant religious freedoms when elected king of Bohemia in May 1617, but his record in Styria led to the suspicion he was only awaiting a chance to overturn them. This was exacerbated by several legal disputes over property, all of which were decided in favour of the Catholic Church. In May 1618, Protestant nobles led by Count Thurn met in Prague Castle with Ferdinand's two Catholic representatives, Vilem Slavata and Jaroslav Borzita. In an event known as the Third Defenestration of Prague, the two men and their secretary Philip Fabricius were thrown out of the castle windows, although all three survived.
Thurn established a new government, and the conflict expanded into Silesia and the Habsburg heartlands of Lower and Upper Austria, where much of the nobility was also Protestant. One of the most prosperous areas of the Empire, Bohemia's electoral vote was also essential to ensuring Ferdinand succeeded Matthias as Emperor, and Habsburg prestige required its recapture. Chronic financial weakness meant prior to 1619 the Austrian Habsburgs had no standing army of any size, leaving them dependent on Maximilian and their Spanish relatives for money and men.
Spanish involvement inevitably drew in the Dutch, and potentially France, although the strongly Catholic Louis XIII faced his own Protestant rebels at home and refused to support them elsewhere. It also provided opportunities for external opponents of the Habsburgs, including the Ottoman Empire and Savoy. Funded by Frederick and the Duke of Savoy, a mercenary army under Ernst von Mansfeld succeeded in stabilising the Bohemian position over the winter of 1618. Attempts by Maximilian of Bavaria and John George of Saxony to broker a negotiated solution ended when Matthias died in March 1619, since it convinced many the Habsburgs were fatally damaged.
By mid-June, the Bohemian army under Thurn was outside Vienna; Mansfeld's defeat by Spanish-Imperial forces at Sablat forced him to return to Prague, but Ferdinand's position continued to worsen. Gabriel Bethlen, Calvinist Prince of Transylvania, invaded Hungary with Ottoman support, although the Habsburgs persuaded them to avoid direct involvement, helped by the outbreak of hostilities with Poland in 1620, followed by the 1623 to 1639 war with Persia.
On 19 August, the Bohemian Estates rescinded Ferdinand's 1617 election as king, and on 26th, formally offered the crown to Frederick instead; two days later, Ferdinand was elected Emperor, making war inevitable if Frederick accepted. With the exception of Christian of Anhalt, his advisors urged him to reject it, as did the Dutch, the Duke of Savoy, and his father-in-law James. 17th century Europe was a highly structured and socially conservative society, and their lack of enthusiasm was due to the implications of removing a legally elected ruler, regardless of religion.
As a result, although Frederick accepted the crown and entered Prague in October 1619, his support gradually eroded over the next few months. In July 1620, the Protestant Union proclaimed its neutrality, while John George of Saxony agreed to back Ferdinand in return for Lusatia, and a promise to safeguard the rights of Lutherans in Bohemia. A combined Imperial-Catholic League army funded by Maximilian and led by Count Tilly pacified Upper and Lower Austria before invading Bohemia, where they defeated Christian of Anhalt at the White Mountain in November 1620. Although the battle was far from decisive, the rebels were demoralised by lack of pay, shortages of supplies and disease, while the countryside had been devastated by Imperial troops. Frederick fled Bohemia and the revolt collapsed.
The Palatinate Campaign
By abandoning Frederick, the German princes hoped to restrict the dispute to Bohemia, but Maximilian's dynastic ambitions made this impossible. In the October 1619 Treaty of Munich, Ferdinand agreed to transfer the Palatinate's electoral vote to Bavaria and allow him to annex the Upper Palatinate. Many Protestants supported Ferdinand because they objected to deposing the legally elected king of Bohemia, and now opposed Frederick's removal on the same grounds. Doing so turned the conflict into a contest between Imperial authority and "German liberties", while Catholics saw an opportunity to regain lands lost since 1555. The combination destabilised large parts of the Empire.
The strategic importance of the Palatinate and its proximity to the Spanish Road drew in external powers; in August 1620, the Spanish occupied the Lower Palatinate. James responded to this attack on his son-in-law by sending naval forces to threaten Spanish possessions in the Americas and the Mediterranean, and announced he would declare war if Spinola had not withdrawn his troops by spring 1621. These actions were greeted with approval by his domestic critics, who considered his pro-Spanish policy a betrayal of the Protestant cause.
Spanish chief minister Olivares correctly interpreted this as an invitation to open negotiations, and in return for an Anglo-Spanish alliance offered to restore Frederick to his Rhineland possessions. Since Frederick demanded full restitution of his lands and titles, which was incompatible with the Treaty of Munich, hopes of reaching a negotiated peace quickly evaporated. When the Eighty Years War restarted in April 1621, the Dutch provided Frederick military support to regain his lands, along with a mercenary army under Mansfeld paid for with English subsidies. Over the next eighteen months, Spanish and Catholic League forces won a series of victories; by November 1622, they controlled most of the Palatinate, apart from Frankenthal, held by a small English garrison under Sir Horace Vere. Frederick and the remnants of Mansfeld's army took refuge in the Dutch Republic.
At a meeting of the Imperial Diet in February 1623, Ferdinand forced through provisions transferring Frederick's titles, lands and electoral vote to Maximilian. He did so with support from the Catholic League, despite strong opposition from Protestant members, as well as the Spanish. The Palatinate was clearly lost; in March, James instructed Vere to surrender Frankenthal, while Tilly's victory over Christian of Brunswick at Stadtlohn in August completed military operations. However, Spanish and Dutch involvement in the campaign was a significant step in internationalising the war, while Frederick's removal meant other Protestant princes began discussing armed resistance to preserve their own rights and territories.
Danish intervention (1625–1629)
With Saxony dominating the Upper Saxon Circle and Brandenburg the Lower, both kreis had remained neutral during the campaigns in Bohemia and the Palatinate. After Frederick was deposed in 1623, John George of Saxony and the Calvinist George William of Brandenburg feared Ferdinand intended to reclaim former Catholic bishoprics currently held by Lutherans (see Map). This seemed confirmed when Tilly's Catholic League army occupied Halberstadt in early 1625.
As Duke of Holstein, Christian IV was also a member of the Lower Saxon circle, while Denmark's economy relied on the Baltic trade and tolls from traffic through the Øresund. In 1621, Hamburg accepted Danish 'supervision', while his son Frederick became joint-administrator of Lübeck, Bremen and Verden. Possession of these territories ensured Danish control of the Elbe and Weser rivers.
Ferdinand had paid Wallenstein for his support against Frederick with estates confiscated from the Bohemian rebels, and now contracted with him to conquer the north on a similar basis. In May 1625, the Lower Saxony kreis elected Christian their military commander, although not without resistance; Saxony and Brandenburg viewed Denmark and Sweden as competitors, and wanted to avoid either becoming involved in the Empire. Attempts to negotiate a peaceful solution failed as the conflict in Germany became part of the wider struggle between France and their Habsburg rivals in Spain and Austria.
In the June 1624 Treaty of Compiègne, France subsidised the Dutch war against Spain for a minimum of three years. Under the December 1625 Treaty of The Hague, the Dutch and English now agreed to finance Danish intervention in the Empire. Intended as the basis of a wider coalition against Ferdinand, France, Sweden, Savoy and the Republic of Venice were also invited to join, but it was overtaken by events. In early 1626, Cardinal Richelieu, main architect of the alliance, faced a new Huguenot rebellion; in the March Treaty of Monzón, France withdrew from Northern Italy, re-opening the Spanish Road.
The intervention involved three Protestant armies; the main force under Christian IV was to advance down the Weser, while Mansfeld attacked Wallenstein in Magdeburg and Christian of Brunswick linked up with the Calvinist Maurice of Hesse-Kassel. The advance quickly fell apart; Mansfeld was defeated at Dessau Bridge in April, and when Maurice refused to support him, Christian of Brunswick fell back on Wolfenbüttel, where he died of disease shortly after. The Danes were comprehensively beaten at Lutter in August, and Mansfeld's army dissolved following his death in November.
Many of Christian's German allies, such as Hesse-Kassel and Saxony, had little interest in replacing Imperial domination for Danish, while few of the subsidies agreed in the Treaty of the Hague were ever paid. Charles I of England allowed Christian to recruit up to 9,000 Scottish mercenaries, but they took time to arrive, and while able to slow Wallenstein's advance, were insufficient to stop him. By the end of 1627, Wallenstein occupied Mecklenburg, Pomerania and Jutland, and began making plans to construct a fleet capable of challenging Danish control of the Baltic. He was supported by Spain, for whom it provided an opportunity to open another front against the Dutch.
In May 1628, his deputy von Arnim besieged Stralsund, the only port with large enough shipbuilding facilities, but this brought Sweden into the war. Gustavus Adolphus despatched several thousand Scots and Swedish troops under Alexander Leslie to Stralsund, who was appointed governor. Von Arnim was forced to lift the siege on 4 August, but three weeks later, Christian suffered another defeat at Wolgast. He began negotiations with Wallenstein, who despite his recent victories was concerned by the prospect of Swedish intervention, and thus anxious to make peace.
With Austrian resources stretched by the outbreak of the War of the Mantuan Succession, Wallenstein persuaded Ferdinand to agree relatively lenient terms in the June 1629 Treaty of Lübeck. Christian retained his German possessions of Schleswig and Holstein, in return for relinquishing Bremen and Verden, and abandoning support for the German Protestants. While Denmark kept Schleswig and Holstein until 1864, this effectively ended its reign as the predominant Nordic state.
Once again, the methods used to obtain victory explain why the war failed to end. Ferdinand paid Wallenstein by letting him confiscate estates, extort ransoms from towns, and allowing his men to plunder the lands they passed through, regardless of whether they belonged to allies or opponents. Anger at such tactics and his growing power came to a head in early 1628 when Ferdinand deposed the hereditary Duke of Mecklenburg, and appointed Wallenstein in his place. Although opposition to this act united all German princes regardless of religion, Maximilian of Bavaria was compromised by his acquisition of the Palatinate; while Protestants wanted Frederick restored and the position returned to that of 1618, the Catholic League argued only for pre-1627.
Made over-confident by success, in March 1629 Ferdinand passed an Edict of Restitution, which required all lands taken from the Catholic church after 1555 to be returned. While technically legal, politically it was extremely unwise, since doing so would alter nearly every single state boundary in North and Central Germany, deny the existence of Calvinism and restore Catholicism in areas where it had not been a significant presence for nearly a century. Well aware none of the princes involved would agree, Ferdinand used the device of an Imperial edict, once again asserting his right to alter laws without consultation. This new assault on 'German liberties' ensured continuing opposition and undermined his previous success.
Swedish intervention; 1630 to 1635
As ever, Richelieu's policy was to 'arrest the course of Spanish progress', and 'protect her neighbours from Spanish oppression'. With French resources tied up in Italy, he helped negotiate the September 1629 Truce of Altmark between Sweden and Poland, freeing Gustavus Adolphus to enter the war. Partly a genuine desire to support his Protestant co-religionists, like Christian he also wanted to maximise his share of the Baltic trade that provided much of Sweden's income.
With Swedish-occupied Stralsund providing a bridgehead, in June 1630 nearly 18,000 Swedish troops landed in the Duchy of Pomerania. Gustavus signed an alliance with Bogislaw XIV, Duke of Pomerania, securing his interests in Pomerania against the Catholic Polish–Lithuanian Commonwealth, another Baltic competitor linked to Ferdinand by family and religion. The Smolensk War is considered a separate but related part of the Thirty Years' War.
Expectations of widespread support proved unrealistic; by the end of 1630, the only new Swedish ally was Magdeburg, which was besieged by Tilly. Despite the devastation inflicted on their territories by Imperial soldiers, both Saxony and Brandenburg had their own ambitions in Pomerania, which clashed with those of Gustavus; previous experience also showed inviting external powers into the Empire was easier than getting them to leave.
However, once again Richelieu provided the requisite support; in the 1631 Treaty of Bärwalde, he provided funds for the Heilbronn League, a Swedish-led coalition of German Protestant states, including Saxony and Brandenburg. Payments amounted to 400,000 Reichstaler, or one million livres per year, plus an additional 120,000 Reichstalers for 1630. While less than 2% of the total French state budget, it made up over 25% of the Swedish, and allowed Gustavus to support an army of 36,000. He won major victories at Breitenfeld in September 1631, then Rain in April 1632, where Tilly was killed. In these battles, Gustavus used, among other things, the well-trained Finnish light cavalrymen Hakkapeliitta, which were excelled in sudden and savage attacks, raiding and reconnaissance.
After Tilly's death, Ferdinand turned once again to Wallenstein; knowing Gustavus was over extended, he marched into Franconia and established himself at Fürth, threatening the Swedish supply chain. In late August, Gustavus incurred heavy losses in an unsuccessful assault on the town, arguably the greatest blunder in his German campaign. Two months later, the Swedes won a resounding victory at Lützen, where Gustavus was killed. Rumours now began circulating Wallenstein was preparing to switch sides, and in February 1634, Ferdinand issued orders for his arrest; on 25th, he was assassinated by one of his officers in Cheb.
Phase II; France joins the war 1635 to 1648
Defeat at Nördlingen threatened Sweden's participation, leading Richelieu to intervene directly. After tense negotiations with Swedish Chancellor Axel Oxenstierna, in the April 1635 Treaty of Compiègne Richelieu agreed to provide additional subsidies, and declared war on Spain in May, beginning the 1635 to 1659 Franco-Spanish War. A few days later, Ferdinand withdrew the Edict and signed the Peace of Prague, dissolving the Heilbronn and Catholic Leagues, and creating a single Imperial army, although Saxony and Bavaria retained control of their own forces. This is generally seen as the point when the conflict ceased to be primarily a German civil war.
After invading the Spanish Netherlands in May 1635, the poorly equipped French army collapsed, suffering 17,000 casualties from disease and desertion. A Spanish offensive in 1636 reached Corbie in Northern France; although it caused panic in Paris, lack of supplies forced them to retreat, and it was not repeated. In March 1636, France finally joined the Thirty Years War in alliance with Sweden, launching offensives in Germany and the Low Countries. At the same time, the Swedes under Johan Banér marched into Brandenburg; victory at Wittstock on 4 October 1636 regained most of the ground lost after Nördlingen.
Ferdinand II died in February 1637 and was succeeded by his son Ferdinand III, who faced a rapidly deteriorating military situation. Dutch leader Frederick Henry recaptured Breda in October, and three months later Bernhard of Saxe-Weimar destroyed an Imperial army at Rheinfelden. Although von Hatzfeldt defeated a Swedish-English-Palatine force at Vlotho in October 1638, Breisach's surrender to Bernhard in December secured French control of Alsace and the Rhineland, severing the Spanish Road. Spain was now forced to resupply their armies in Flanders by sea, making them vulnerable to the Dutch navy.
These setbacks put increasing pressure on both Ferdinand and Spanish minister Olivares to make peace. The Dutch destroyed a large supply convoy at the Downs in October 1639, while Madrid's inability to prevent attacks on Portuguese possessions in Africa and the Americas caused increasing unrest in Portugal, then part of the Spanish Empire. In 1640, the French captured Arras, and over-ran the rest of Artois, while protests against heavy taxes led to revolts in Portugal and Catalonia. Many Spanish officials felt it was time to accept Dutch independence, but despite these challenges, their Empire remained a formidable power.
Richelieu died in 1642, and was replaced as chief minister by Cardinal Mazarin, followed on 14 May 1643 by the death of Louis XIII, leaving his five-year-old son Louis XIV as heir. Five days later, the Prince de Condé won a decisive French victory at Rocroi, although he was unable to take full advantage. Mazarin began seeking a negotiated peace; 25 years of constant war had devastated the countryside, forcing armies to spend more time foraging than fighting, and drastically reducing their ability to sustain campaigns.
After Wittstock, the Swedish army regained the initiative in Germany; at Second Breitenfeld in October 1642, Swedish commander Lennart Torstenson defeated an Imperial army led by Archduke Leopold Wilhelm of Austria and Ottavio Piccolomini. Leopold suffered 20,000 casualties, including 5,000 prisoners and 46 guns, compared to Swedish losses of 4,000 killed or wounded. With Saxony occupied by Sweden, Ferdinand III accepted the need to include them in peace negotiations.
In 1643, Frederick III of Denmark re-entered the conflict as an Imperial ally, threatening the Swedes with a war on two fronts. Torstensson expelled the Danes from Bremen-Verden and occupied Jutland; after a decisive naval defeat at Fehmarn in October 1644, the Danes sued for peace. The Imperial army under Gallas retreated into Bohemia, pursued by Torstenson, whose victory at Jankau in March 1645 allowed him to threaten both Prague and Vienna.
In May, a Bavarian army under Franz von Mercy destroyed a French detachment at Herbsthausen, but he was defeated and killed at Second Nördlingen in August. As with Rocroi, Condé was unable to fully exploit this success; his losses shocked the French court, while 25 years of constant war had devastated the countryside, forcing armies to spend more time foraging than fighting, and drastically reducing their ability to sustain campaigns.
In September 1645, the Swedes agreed a six-month truce with Saxony; Ferdinand accepted a military solution was no longer possible, and in October ordered his diplomats to begin serious negotiations at Westphalia. However, fighting continued as both sides tried to improve their bargaining position; suffering from ill-health, at the end of 1645 Torstenson was replaced by Carl Gustaf Wrangel, who over-ran Bavaria in the autumn of 1646. Maximilian was desperate to end the war he was largely responsible for starting, while Mazarin feared Sweden becoming too strong; on 14 March 1647, Bavaria, Cologne, France, and Sweden signed the Truce of Ulm.
During the winter of 1647, Mazarin suggested to the Spanish they exchange Catalonia, currently occupied by France, for the Spanish Netherlands; angered by this, in January 1648 the Dutch signed the Peace of Münster, ending their war with Spain. In May, a combined Franco-Swedish army destroyed the last major Imperial army at Zusmarshausen, while a second Swedish force besieged Prague. On 24 October, Ferdinand finally signed peace treaties with France and Sweden; the Swedes retreated from Prague, but not before looting many valuable treasures, including the Codex Gigas, today preserved in Stockholm.
The conflict outside Germany
Northern Italy had been contested by France and the Habsburgs for centuries, since it was vital for control of South-West France, an area with a long history of opposition to the central authorities. While Spain remained the dominant power in Italy, its reliance on long exterior lines of communication was a potential weakness, especially the Spanish Road; this overland route allowed them to move recruits and supplies from Naples and Lombardy to their army in Flanders.
French policy was to seek to disrupt this road wherever possible, either by attacking the Spanish-held Duchy of Milan, or by blocking the Alpine passes. The strategic importance of the Duchy of Mantua meant when the direct male line became extinct in December 1627, both powers became involved in the 1628 to 1631 War of the Mantuan Succession. The situation was complicated by Savoy, which saw an opportunity to gain territory; in March 1629, the French stormed Savoyard positions in the Pas de Suse, lifted the siege of Casale and captured the strategic fortress of Pinerolo.
France and Savoy made peace in the April 1629 Treaty of Suza, which allowed French troops passage through Savoy, and recognised their control of Casale and Pinerolo. Possession of these fortresses gave France effective control of Piedmont, protected the Alpine passes into Southern France, and allowed them to threaten Milan at will.
Between 1629 and 1631, plague exacerbated by troop movements killed 60,000 in Milan and 46,000 in Venice, with proportionate losses elsewhere. Combined with the diversion of Imperial resources caused by Swedish intervention in 1630, this led to the Treaty of Cherasco in June 1631. The French candidate, Charles I Gonzaga, was confirmed as Duke of Mantua; although Richelieu's representative, Cardinal Mazarin, agreed to evacuate Pinerolo, it was later secretly returned under an agreement with Victor Amadeus I, Duke of Savoy. With the exception of the 1639 to 1642 Piedmontese Civil War, this secured the French position in Northern Italy for the next twenty years.
Catalonia; Reapers' War
Throughout the 1630s, attempts to increase taxes to pay for the costs of the war in the Netherlands led to protests throughout Spanish territories; in 1640, these erupted into open revolts in Portugal and Catalonia, supported by Richelieu as part of his 'war by diversion'. Prompted by France, the rebels proclaimed the Catalan Republic in January 1641. The Madrid government quickly assembled an army of 26,000 men to crush the revolt, and on 23 January, they defeated the Catalans at Martorell. The French now persuaded the Catalan Courts to recognise Louis XIII as Count of Barcelona, and ruler of the Principality of Catalonia.
Three days later, a combined French-Catalan force defeated the Spanish at Montjuïc, a victory which secured Barcelona. However, the rebels soon found the new French administration differed little from the old, turning the war into a three-sided contest between the Franco-Catalan elite, the rural peasantry, and the Spanish. There was little serious fighting after France took control of Perpignan and Roussillon, establishing the modern Franco-Spanish border in the Pyrenees. In 1651, Spain recaptured Barcelona, ending the revolt.
In 1580, Philip II of Spain became ruler of the Portuguese Empire, and the 1602 to 1663 Dutch–Portuguese War began as an offshoot of the Dutch fight for independence from Spain. Even after union, the Portuguese dominated the Atlantic trade in Triangular trade, exporting slaves from West Africa and Angola to work sugar plantations in Brazil. In 1621, the Dutch West India Company was formed to challenge this control and captured the Brazilian port of Salvador in 1624. Although retaken in 1625, a second fleet established Dutch Brazil in 1630, which was then relinquished in 1654.
This was accompanied by a struggle for control in the East Indies and Africa, increasing Portuguese resentment against the Spanish, who were perceived as prioritising their own colonies. In the end, the Portuguese retained control of Brazil and Angola, but the Dutch captured the Cape of Good Hope, as well as Portuguese possessions in Malacca, the Malabar Coast, the Moluccas and Ceylon.
Peace of Westphalia (1648)
Preliminary discussions began in 1642 but only became serious in 1646; talks were split between the towns of Münster and Osnabrück. The future Pope Alexander VII and the Venetian Republic acted as mediators, with a total of 109 delegations attending at one time or other. The Peace consisted of three separate agreements; the Peace of Münster between Spain and the Dutch Republic, the treaty of Osnabrück between the Empire and Sweden, plus the treaty of Münster between the Empire and France.
The Peace of Münster was the first to be signed on 30 January 1648; it was part of Westphalia because the provinces that made up the Dutch Republic were still technically part of the Spanish Netherlands and thus Imperial territories. The treaty confirmed Dutch independence, although the Imperial Diet did not formally accept that it was no longer part of the Empire until 1728. The Dutch were also given a monopoly over trade conducted through the Scheldt estuary, confirming the commercial ascendancy of Amsterdam; Antwerp, capital of the Spanish Netherlands and previously the most important port in Northern Europe, would not recover until the late 19th century.
Negotiations with France and Sweden were conducted in conjunction with the Imperial Diet, and were multi-sided discussions involving many of the German states. This resulted in the treaties of Münster and Osnabrück, making peace with France and Sweden respectively. Ferdinand still resisted signing, but after France gained a crushing victory over Spain at Lens in August, and with Swedish troops attacking Prague, he finally did so on 24 October 1648.
Taken as a whole, the consequences of these two treaties can be divided into the internal political settlement and external territorial changes. Ferdinand accepted the supremacy of the Imperial Diet and legal institutions, reconfirmed the Augsburg settlement, and recognised Calvinism as a third religion. In addition, Christians residing in states where they were a minority, such as Catholics living under a Lutheran ruler, were guaranteed freedom of worship and equality before the law. Brandenburg-Prussia received Farther Pomerania, and the bishoprics of Magdeburg, Halberstadt, Kammin, and Minden. Frederick's son Charles Louis regained the Lower Palatinate and became the eighth Imperial elector, although Bavaria kept the Upper Palatinate and its electoral vote.
Externally, the treaties formally acknowledged the independence of the Dutch Republic and the Swiss Confederacy, effectively autonomous since 1499. In Lorraine, the Three Bishoprics of Metz, Toul and Verdun, occupied by France since 1552, were formally ceded, as were the cities of the Décapole in Alsace, with the exception of Strasbourg and Mulhouse. Sweden received an indemnity of five million thalers, the Imperial territories of Swedish Pomerania, and Prince-bishoprics of Bremen and Verden; this gave them a seat in the Imperial Diet.
The Peace was later denounced by Pope Innocent X, who regarded the bishoprics ceded to France and Brandenburg as property of the Catholic church, and thus his to assign. It also disappointed many exiles by accepting the restoration of Catholicism as the dominant religion in Bohemia, Upper and Lower Austria, strongholds of Protestantism in 1618. Fighting did not end immediately, since demobilising over 200,000 soldiers was a complex business, and the last Swedish garrison did not leave Germany until 1654.
The settlement failed to achieve its stated intention of achieving a 'universal peace'; Mazarin insisted on excluding the Burgundian Circle from the treaty of Münster, allowing France to continue its campaign against Spain in the Low Countries, a war that continued until the 1659 Treaty of the Pyrenees. The political disintegration of the Polish commonwealth led to the 1655 to 1660 Second Northern War with Sweden, which also involved Denmark, Russia and Brandenburg, while two Swedish attempts to impose its control on the port of Bremen failed in 1654 and 1666.
It has been argued the Peace established the principle known as Westphalian sovereignty, the idea of non-interference in domestic affairs by outside powers, although this has since been challenged. The process, or 'Congress' model, was adopted for negotiations at Aix-la-Chapelle in 1668, Nijmegen in 1678, and Ryswick in 1697; unlike the 19th century 'Congress' system, these were to end wars, rather than prevent them, so references to the 'balance of power' can be misleading.
Human and financial cost of the war
Historians often refer to the 'General Crisis' of the mid-17th century, a period of sustained conflict in states such as China, the British Isles, Tsarist Russia and the Holy Roman Empire. In all these areas, war, famine and disease inflicted severe losses on local populations. While the Thirty Years War ranks as one of the worst of these events, precise numbers are disputed; 19th century nationalists often increased them to illustrate the dangers of a divided Germany.
The war has been described as one of the greatest medical catastrophes in history. Well into the 19th century, the leading cause of mortality even for soldiers was disease; of an estimated 600,000 military deaths between 1618 and 1648, only 200,000 were killed in combat. Based on analysis of contemporary reports, less than 3% of civilian deaths were the result of military action; the major causes were starvation (12%), bubonic plague (64%), typhus (4%), and dysentery (5%).
Parish records show regular outbreaks of these were common for decades prior to 1618, but the conflict greatly accelerated their spread. This was due to the influx of soldiers from foreign countries, the shifting locations of battle fronts, as well as the displacement of rural populations and migration into already crowded cities. Poor harvests throughout the 1630s and repeated plundering of the same areas led to widespread famine; contemporaries record people eating grass, or too weak to accept alms, while instances of cannibalism were common.
The modern consensus is the population of the Holy Roman Empire declined from 18 to 20 million in 1600 to 11–13 million in 1650, and did not reach pre-war levels until 1750. Nearly 50% of these losses appear to have been incurred during the first period of Swedish intervention from 1630 to 1635. It is suggested the high mortality rate compared to the Wars of the Three Kingdoms in Britain was partly due to the reliance of all sides on foreign mercenaries, often unpaid and required to live off the land. Lack of a sense of 'shared community' resulted in atrocities such as the destruction of Magdeburg, while creating large numbers of refugees, who were extremely susceptible to sickness and hunger. While flight may have saved lives in the short-term, in the long run it often proved catastrophic.
In 1940, agrarian historian Günther Franz published Der Dreissigjährige Krieg und das Deutsche Volk, a detailed analysis of regional data from across Germany; his membership of the Nazi Party meant his objectivity was challenged post-1945, but recent reviews support his general findings. He concluded "about 40% of the rural population fell victim to the war and epidemics; in the cities,...33%". There were wide regional variations; in the Duchy of Württemberg, the number of inhabitants fell by nearly 60%.
These figures can be misleading, since Franz calculated the absolute decline in pre and post-war populations, or 'total demographic loss'. It includes factors unrelated to death or disease, such as permanent migration to areas outside the Empire, or lower birthrates, a less obvious impact of extended warfare. Although suggested towns over-stated losses to avoid taxes, individual records show serious declines; from 1620 to 1650, the population of Munich fell from 22,000 to 17,000, that of Augsburg from 48,000 to 21,000.
The financial impact is less clear; while the war caused short-term economic dislocation, overall it accelerated existing changes in trading patterns. It does not appear to have reversed ongoing macro-economic trends, such as the reduction of price differentials between regional markets, and a greater degree of market integration across Europe. The death toll may have improved living standards for the survivors; one study shows wages in Germany increased by 40% in real terms between 1603 and 1652.
The breakdown of social order caused by the war was in some ways more significant and longer lasting than the immediate damage. The collapse of local government created landless peasants, who banded together to protect themselves from the soldiers of both sides, and led to widespread rebellions in Upper Austria, Bavaria and Brandenburg. Soldiers devastated one area then moved on, abandoning large tracts of land and changing the eco-system. Food shortages were worsened by an explosion in the rodent population; Bavaria was over-run by wolves in the winter of 1638, its crops destroyed by packs of wild pigs the following spring.
Contemporaries spoke of a 'frenzy of despair' as people sought to make sense of the turmoil and hardship unleashed by the war. Their attribution by some to supernatural causes led to a series of Witch-hunts, beginning in Franconia in 1626 and quickly spreading to other parts of Germany, which were often exploited for political purposes. They originated in the Bishopric of Würzburg, an area with a history of such events going back to 1616 and now re-ignited by Bishop von Ehrenberg, a devout Catholic eager to assert the church's authority in his territories. By the time he died in 1631, over 900 people from all levels of society had been executed.
At the same time, Prince-Bishop Johann von Dornheim held a similar series of large-scale witch trials in the nearby Bishopric of Bamberg. A specially designed Malefizhaus, or 'crime house', was erected containing a torture chamber, whose walls were adorned with Bible verses, where the accused were interrogated. These trials lasted five years and claimed over one thousand lives, including long-time Bürgermeister, or Mayor, Johannes Junius, and Dorothea Flock, second wife of Georg Heinrich Flock, whose first wife had also been executed for witchcraft in May 1628. During 1629, another 274 suspected witches were killed in the Bishopric of Eichstätt, plus another 50 in the adjacent Duchy of Palatinate-Neuburg.
Elsewhere, persecution followed Imperial military success, expanding into Baden and the Palatinate following their reconquest by Tilly, then into the Rhineland. Mainz and Trier also witnessed the mass killing of suspected witches, as did Cologne, where Ferdinand of Bavaria presided over a particularly infamous series of witchcraft trials, including that of Katharina Henot, who was executed in 1627. In 2012, she and other victims were officially exonerated by the Cologne City Council.
However, how far these witch-hunts can be seen as reflecting a breakdown in society is debated, since many took place in areas relatively untouched by the war. Ferdinand and his advisors were greatly concerned by the brutal nature of the Würzburg and Bamberg trials, fearing they would discredit the Counter-Reformation, and active persecution largely ended by 1630. A scathing condemnation of the trials, Cautio Criminalis, was written by professor and poet Friedrich Spee, himself a Jesuit and former "witch confessor". This influential work was later credited with ending the practice in Germany, and eventually throughout Europe.
The Peace reconfirmed "German liberties", ending Habsburg attempts to convert the Holy Roman Empire into an absolutist state similar to Spain. This allowed Bavaria, Brandenburg-Prussia, Saxony and others to pursue their own policies, while Sweden gained a permanent foothold in the Empire. Despite these setbacks, the Habsburg lands suffered less from the war than many others and became a far more coherent bloc with the absorption of Bohemia, and restoration of Catholicism throughout their territories.
By laying the foundations of the modern nation state, Westphalia changed the relationship of subjects and their rulers. Previously, many had overlapping, sometimes conflicting political and religious allegiances; they were now understood to be subject first and foremost to the laws and edicts of their respective state authority, not to the claims of any other entity, be it religious or secular. This made it easier to levy national armies of significant size, loyal to their state and its leader; one lesson learned from Wallenstein and the Swedish invasion was the need for their own permanent armies, and Germany as a whole became a far more militarised society.
The benefits of Westphalia for the Swedes proved short-lived. Unlike French gains which were incorporated into France, Swedish territories remained part of the Empire, and they became members of the Lower and Upper Saxon kreis. While this gave them seats in the Imperial Diet, it also brought them conflict with both Brandenburg-Prussia and Saxony, who were competitors in Pomerania. The income from their imperial possessions remained in Germany and did not benefit the kingdom of Sweden; although they retained Swedish Pomerania until 1815, much of it was ceded to Prussia in 1679 and 1720.
Arguably, France gained more from the Thirty Years' War than any other power; by 1648, most of Richelieu's objectives had been achieved. They included separation of the Spanish and Austrian Habsburgs, expansion of the French frontier into the Empire, and an end to Spanish military supremacy in Northern Europe. Although the Franco-Spanish conflict continued until 1659 and Spain remained a global force for another two centuries, Westphalia allowed Louis XIV of France to complete the process of replacing her as the predominant European power.
Although religion remained an issue throughout the 17th century, it was the last major war in Continental Europe with religion as its primary driver; later such conflicts were either internal, such as the Camisards in South-Western France, or relatively minor like the 1712 Toggenburg War. At the same time, it created the outlines of a Europe that persisted until 1815 and beyond; the nation-state of France, the beginnings of a unified Germany and separate Austro-Hungarian bloc, a diminished but still significant Spain, independent smaller states like Denmark, Sweden and Switzerland, along with a Low Countries split between the Dutch Republic and what became Belgium in 1830.
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- La vida y hechos de Estebanillo González, hombre de buen humor, compuesta por él mismo (Antwerp, 1646): The last of the great Spanish Golden Age picaresque novels, this is set against the background of the Thirty Years' War. It is thought to have been written by a man in the entourage of Ottavio Piccolomini. The main character crisscrosses Europe at war in his role as messenger; he witnesses the 1634 battle of Nordlingen, among other events.
- Simplicius Simplicissimus (1668) by Hans Jakob Christoffel von Grimmelshausen, one of the most important German novels of the 17th century, is the comic fictional autobiography of a half-German, half-Scottish peasant turned mercenary. He serves under various powers during the war. The book is based on the author's first-hand experience.
- Memoirs of a Cavalier (1720) by Daniel Defoe is subtitled "A Military Journal of the Wars in Germany, and the Wars in England. From the Years 1632 to 1648".
- Alessandro Manzoni's The Betrothed (1842) is an historical novel taking place in Italy in 1629. It treats a couple whose marriage is interrupted by the bubonic plague, and other complications of Thirty Years' War.
- G. A. Henty, The Lion of the North: The Adventures of a Scottish Lad during the Thirty Years' War (2 vol., 1997 reprint). It is available under a number of subtitle variants, including a comic strip. Also Won By the Sword: A Story of the Thirty Years' War
- Gertrud von Le Fort's historical novel Die Magdeburgische Hochzeit is a fictional account of romantic and political intrigue during the siege of Magdeburg.
- Der Wehrwolf (1910) by Hermann Löns is a novel about an alliance of peasants using guerrilla tactics to fight the enemy during the Thirty Years' War.
- Alfred Döblin's sprawling historical novel Wallenstein (1920) is set during the Thirty Years' War; it explores the court of Holy Roman Emperor Ferdinand.
- The Last Valley (1959), by John Pick, is about two men fleeing the Thirty Years' War.
- Das Treffen in Telgte (1979), by Günter Grass, is set in the aftermath of the war. He implicitly compared conditions to those in postwar Germany in the late 1940s.
- Michael Moorcock's novel, The War Hound and the World's Pain (1981), features a central character of Ulrich von Bek, a mercenary who took part in the sack of Magdeburg.
- Eric Flint's Ring of Fire series of alternative history novels, deals with a temporally displaced American town from the early 21st century that occupies territory in the early 1630s in war-torn Germany.
- Parts of Neal Stephenson's Baroque Cycle are set in lands devastated by the Thirty Years' War.
- In Die Henkerstochter (2008) by Oliver Pötzsch, the protagonist, hangman Jakob Kuisl, and other prominent characters have served in General Tilly's army and participated in the sacking of the city of Magdeburg during the Thirty Years' War. "The Great War" and Swedish incursion into north-central Germany are frequently referenced.
- Talbot Company (2018) by Michael Regal is a story about a mercenary company set during the 30 Years' War. The eponymous company is hired to prevent a rogue Polish noble from restarting the Polish Swedish War, which Poland lost.
- Bruce Gardner's 2018 novel, Hope of Ages Past: An Epic Novel of Enduring Faith, Love, and the Thirty Years War, tells the story of the sack of Magdeburg and the Battle of Breitenfeld through the stories of a young Lutheran pastor and a peasant girl.
- Friedrich Schiller's Wallenstein trilogy (1799) is a fictional account of the downfall of this general.
- Edmond Rostand's play Cyrano de Bergerac (1897) (act IV is set during the siege of Arras in 1640.)
- Bertolt Brecht's play Mutter Courage und ihre Kinder (1939), an antiwar piece, is set during the Thirty Years' War.
- Queen Christina (1933), a film starring Greta Garbo, opens with the death of Christina's father, King Gustavus Adolphus, at the Battle of Lützen in the Thirty Years' War. The plot of the film is set against the backdrop of the war and Christina's determination as queen, depicted a decade later, to end the war and bring about peace.
- A Jester's Tale (1964) is a Czech film directed by Karel Zeman. Described by Zeman as a "pseudo-historical" film, it is an anti-war black comedy set during the Thirty Years' War.
- The Last Valley (1971) is a film starring Michael Caine and Omar Sharif, who discover a temporary haven from the Thirty Years' War. it was adapted from the novel The Last Valley.
- Simplicius Simplicissimus (1934–1957) is an opera adaptation of the novel of the same name, with music by Karl Amadeus Hartmann.
- The Thirty Years' War is briefly referenced in the survival horror game Amnesia: The Dark Descent. The common enemies in the game are former soldiers of the war that abandoned their duty, died and became cursed to roam the woods they died in.
by Sebastian Vrancx
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10 June 1619
Battle of Wimpfen,
6 May 1622
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May to 4 August 1628
Battle of Frankfurt an der Oder,
Battle of Rocroi,
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- Murdoch, S.; Zickerman, K; Marks, H (2012). "The Battle of Wittstock 1636: Conflicting Reports on a Swedish Victory in Germany". Northern Studies. 43.
- Murdoch, Steve; Alexia, Grosjean (2014). Alexander Leslie and the Scottish generals of the Thirty Years' War, 1618–1648. London: Pickering & Chatto.
- Norrhem, Svante (2019). Mercenary Swedes; French subsidies to Sweden 1631–1796. Translated by Merton, Charlotte. Nordic Academic Press. ISBN 978-91-88661-82-1.
- O'Connell, Daniel Patrick (1968). Richelieu. Weidenfeld & Nicolson.
- Outram, Quentin (2001). "The Socio-Economic Relations of Warfare and the Military Mortality Crises of the Thirty Years' War" (PDF). Medical History. 45 (2): 151–84. doi:10.1017/S0025727300067703. PMC 1044352. PMID 11373858.
- Outram, Quentin (2002). "The Demographic impact of early modern warfare". Social Science History. 26 (2): 245–272. doi:10.1215/01455532-26-2-245.
- Parker, Geoffrey (2008). "Crisis and catastrophe: The global crisis of the seventeenth century reconsidered". American Historical Review. 113 (4): 1053–1079. doi:10.1086/ahr.113.4.1053.
- Parker, Geoffrey (1984). The Thirty Years' War. London: Routledge and Kegan Paul.
- Parrott, D (2001). Richelieu's Army: War, Government and Society in France, 1624–1642. Cambridge University Press.
- Pfister, Ulrich; Riedel, Jana; Uebele, Martin (2012). "Real Wages and the Origins of Modern Economic Growth in Germany, 16th to 19th Centuries" (PDF). European Historical Economics Society. 17.
- Polišenský, J. V. (1954). "The Thirty Years' War". Past and Present. 6 (6): 31–43. doi:10.1093/past/6.1.31. JSTOR 649813.
- Polišenský, J. V. (1968). "The Thirty Years' War and the Crises and Revolutions of Seventeenth-Century Europe". Past and Present. 39 (39): 34–43. doi:10.1093/past/39.1.34. JSTOR 649854.
- Polisensky, Joseph (2001). "A Note on Scottish Soldiers in the Bohemian War, 1619–1622". In Murdoch, Steve (ed.). Scotland and the Thirty Years' war, 1618–1648. Leiden: Brill. pp. 109–115.
- Prinzing, Friedrich (1916). Epidemics Resulting from Wars. Oxford: Clarendon Press.
- Pursell, Brennan C. (2003). The Winter King: Frederick V of the Palatinate and the Coming of the Thirty Years' War. Ashgate. ISBN 978-0754634010.
- Rabb, Theodore K (1962). "The Effects of the Thirty Years' War on the German Economy". Journal of Modern History. 34 (1): 40–51. doi:10.1086/238995. JSTOR 1874817.
- Reilly, Pamela (1959). "Friedrich von Spee's Belief in Witchcraft: Some Deductions from the "Cautio Criminalis"". The Modern Language Review. 54 (1). doi:10.2307/3720833. JSTOR 3720833.
- Ringmar, Erik (1996). Identity, Interest and Action: A Cultural Explanation of the Swedish Intervention in the Thirty Years War (2008 ed.). Cambridge University Press. ISBN 978-0521026031.
- Roberts, Michael (1958). Gustavus Adolphus: A History of Sweden, 1611–1632. Longmans, Green and C°.
- Ryan, EA (1948). "Catholics and the Peace of Westphalia" (PDF). Theological Studies. 9 (4): 590–599. doi:10.1177/004056394800900407. S2CID 170555324. Retrieved 7 October 2020.
- Schulze, Max-Stefan; Volckart, Oliver (2019). "The Long-term Impact of the Thirty Years War: What Grain Price Data Reveal" (PDF). Economic History.
- Storrs, Christopher (2006). The Resilience of the Spanish Monarchy 1665–1700. OUP. ISBN 978-0199246373.
- Stutler, James Oliver (2014). Lords of War: Maximilian I of Bavaria and the Institutions of Lordship in the Catholic League Army, 1619-1626 (PDF) (PhD). Duke University.
- Sutherland, NM (1992). "The Origins of the Thirty Years War and the Structure of European Politics". The English Historical Review. CVII (CCCCXXIV). doi:10.1093/ehr/cvii.ccccxxiv.587.
- Theibault, John (1997). "The Demography of the Thirty Years War Re-revisited: Günther Franz and his Critics". German History. 15 (1): 1–21. doi:10.1093/gh/15.1.1.
- Thion, Stephane (2008). French Armies of the Thirty Years' War. Auzielle: Little Round Top Editions.
- Trevor-Roper, Hugh (1967). The Crisis of the Seventeenth Century: Religion, the Reformation and Social Change (2001 ed.). Liberty Fund. ISBN 978-0865972780.
- Van Gelderen, Martin (2002). Republicanism and Constitutionalism in Early Modern Europe: A Shared European Heritage Volume I. Cambridge University Press. ISBN 978-0521802031.
- Van Groesen, Michiel (2011). "Lessons Learned: The Second Dutch Conquest of Brazil and the Memory of the First". Colonial Latin American Review. 20 (2). doi:10.1080/10609164.2011.585770.
- Ward, A. W. (1902). The Cambridge Modern History. Volume 4: The Thirty Years War.
- Wedgwood, CV (1938). The Thirty Years War (2005 ed.). New York Review of Books. ISBN 978-1590171462.
- White, Matthew (2012). The Great Big Book of Horrible Things. W.W. Norton & Co. ISBN 978-0393081923.
- Wilson, Peter H. (2009). Europe's Tragedy: A History of the Thirty Years War. Allen Lane. ISBN 978-0-7139-9592-3.
- Wilson, Peter (2008). "The Causes of the Thirty Years War 1618-48". The English Historical Review. 123 (502). JSTOR 20108541.
- Zaller, Robert (1974). ""Interest of State": James I and the Palatinate". Albion: A Quarterly Journal Concerned with British Studies. 6 (2): 144–175. doi:10.2307/4048141. JSTOR 4048141.
- Helfferich, Tryntje, ed. The Thirty Years' War: A Documentary History, (Indianapolis: Hackett, 2009). 352 pages. 38 key documents including diplomatic correspondence, letters, broadsheets, treaties, poems, and trial records. excerpt and text search
- Sir Thomas Kellie, Pallas Armata or Military Instructions for the Learned, The First Part (Edinburgh, 1627).
- Monro, R. His Expedition with a worthy Scots Regiment called Mac-Keyes, (2 vols., London, 1637) www.exclassics.com/monro/monroint.htm.
- Dr Bernd Warlich has edited four diaries of the Thirty Years' War (1618–1648). These diaries can be viewed (in German) at: http://www.mdsz.thulb.uni-jena.de/sz/index.php
- Wilson, Peter H. ed. The Thirty Years' War: A Sourcebook (2010); includes state documents, treaties, correspondence, diaries, financial records, artwork; 240pp
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- The Thirty Years' War – Czech republic
- The Thirty Years' War LearningSite
- Thirty Years' War Timeline
- Project "Peace of Westphalia" (among others with Essay Volumes of the 26th Exhibition of the Council of Europe "1648: War and Peace in Europe", 1998/99)
- History of the Thirty Years' War by Friedrich von Schiller at Project Gutenberg
- BBC Radio4 documentary – The Invention of Germany: The Thirty Years' War and Magdeburg
- – Sovereignty, International Relations, and the Westphalian Myth
- "The Thirty Years' War – how was peace achieved? (history documentary)". Deutsche Welle Documentary. 1 November 2018. (Part 2)
- "The 30 Years' War (1618–48) and the Second Defenestration of Prague – Professor Peter Wilson". Gresham College. 24 May 2018.
- Reconciled with the Emperor and switched sides in the Peace of Prague (1635).
- Protestantism was effectively wiped out in what is now Austria and the Czech Republic, and it was severely damaged in France, Spain, Portugal, Italy, Greece, Romania, Ireland, Belgium, Poland, Lithuania, Russia, Hungary, Ukraine, Slovakia, eastern Silesia, Slovenia, Croatia, and Serbia. Compare the territorial extent of Protestantism in 1620 and 1648.
- Swedish Intervention
- Includes soldiers from the Spanish Netherlands and Spanish Italy.
- Of the 30,000 citizens, only 5,000 survived.