1565-1569: All-out conflict in Scandinavia
The end of the 1560s was marked by the violent conflict between the Kingdom of Sweden and the Kingdom of Denmark, in which the Kingdom of Norway found itself involved through no fault of its own.
The kingdom of Sweden experienced a troubled and difficult situation during the years 1565-1569, when it was in the midst of a conflict with the kingdom of Denmark.
In early 1565, August Klas Horn was recalled from Livonia to command the Swedish forces and counter the Danish armies. In the spring of 1565, Kalmar was attacked by an army led by Rantzau. Eric XIV and Horn tried to clear the city and the fortress by leading an army to it. As the King of Sweden's army approached, Rantzau preferred to lift the siege and retreat southwards. Eric XIV sought to intercept his adversary and confronted him near Hagby church at the end of May 1565. Despite a favourable numerical advantage, Eric XIV and his army were outflanked and forced to withdraw. At sea, Jacob Kragge sought to break the Danish-Lübeck blockade in the Baltic Sea and mitigate the impact of the blockade on Kalmar. In June 1565, his fleet fought another battle off Öland against the Danish-Lübeck fleet. The battle was fierce and Kragge was forced to withdraw, but not without causing heavy losses on the opposing side. In the autumn of 1565, the Swedes again attacked Blekinge and Skåne, ravaging both provinces and taking control of part of the territory.
In the spring of 1566, the Danes regained control of the lost provinces. In May 1566, Jacob Kragge and August Klas Horn scored a major success at sea against the Danish-Lübeck fleet in the third battle near Öland, further weakening the Danish blockade of the coast. However, the deteriorating mental health of Eric XIV made it difficult for the Swedes to organise a new campaign. In autumn 1566, however, they attacked the province of Halland, sacking Falkenberg and taking Varberg. After these successes, the Swedes moved north and tried to retake Älvsborg. However, their army had to face the Danes near Kungsbacka in November 1566 and suffered a defeat against them, causing them to lose almost all the benefits of the autumn campaign, with the exception of Varberg. During 1567, land battles were limited to skirmishes and raids between the two kingdoms, while on the sea, Jacob Kragge and Klas Horn gained the upper hand over their adversaries, causing them to suffer several defeats - a defeat off Öland in June 1567, then at Bornholm in the summer of 1567, and a blockade of the Øresund in the autumn of 1567. These successes destroyed the Danish-Lübeck blockade and gave the Swedes the upper hand in the Baltic Sea. In the autumn of 1567, Småland and Östergötland suffered the brunt of the conflict as a Danish army led by Daniel Rantzau crossed them, defeating several small Swedish forces in the process. Eric XIV sent a new army to counter the Danish army as it closed in on Stockholm. While the Danes withdrew from the end of October, the Swedes pursued them and tried to intercept their retreat. During November 1567, the Swedes tried to trap the Danish army near Lake Sommen, but only succeeded in destroying the rearguard of Daniel Rantzau's army, while Rantzau and the rest of his army managed to escape to Halland.
During this period, Eric XIV gradually sank into instability and paranoia as he suffered military setbacks against the Danish armies and the hostility of the Swedish nobility grew stronger following the arrest of his brother John. This relationship paralysed the kingdom and led Elisabeth of Hesse to intervene in the kingdom's affairs to ensure its smooth running and preserve the rights of her son Gustav. Elisabeth tried to keep her husband lucid, but her relations with him deteriorated during this period, particularly as a result of the exchanges she had with representatives of the nobility and her brothers Charles and Magnus in an attempt to maintain peace within the kingdom. The deterioration in relations between the king and his wife was exacerbated by Elisabeth of Hesse's growing opposition to Jöran Persson, whom she suspected of manipulating the king. These divisions and oppositions were exacerbated by the death of Prince John in February 1567, who had been weakened by his captivity by Jöran Persson. The death of the king's brother caused consternation and opprobrium among the nobility, with the nobles and other brothers of Eric XIV accusing Jöran Persson of having murdered the prince and even suspecting the king of having supported the act. The nobles demanded that Jöran Persson be dismissed, reinforcing Eric XIV's paranoia and hostility towards the nobility. He was particularly suspicious of the Stures, whom he suspected of trying to overthrow him. Early in the summer of 1567, he had them arrested for an alleged plot against him and his son. This new action precipitated the noble conspiracy against the king, while Elisabeth of Hesse contacted Prince Charles to guarantee her son's rights. At the beginning of September 1567, Eric XIV had the Stures executed without any form of trial, fearing a plot to free them and place them on the throne in his place, to the detriment of his son. This arbitrary execution helped to strengthen the plot against him, with his brother Charles at the head of the conspirators. Elizabeth exchanges with her brother-in-law to guarantee her son's rights while seeking to maintain her relationship with her husband. This did not prevent Eric from having her imprisoned in the autumn of 1567 on suspicion of plotting against him. The Queen's arrest increased opposition to the King, and only the new Danish attack on Stockholm dissuaded Duke Charles and his allies from taking action.
In the early spring of 1568, just as there was a lull in the clashes with the Danes, Duke Charles and his allies decided to take action and arrest Eric XIV for being unable to reign. In March 1568, Charles of Södermanland and his allies arrested his brother at the palace after a brief resistance. They forced Eric XIV to abdicate in favour of his son, while a regency was set up with Charles at its head. The regent had Elisabeth of Hesse released and began negotiations with the Kingdom of Denmark to put an end to the conflict. However, the talks were long and difficult, with Frederick II seeking to gain time in the hope of involving the Kingdom of Poland in the conflict. The news of the Danish-Polish alliance precipitated the end of the initial negotiations. Charles undertook to strengthen the defences of the Duchy of Finland and the territories controlled in Livonia, and in the summer of 1568 prepared a new campaign designed to force the Danes to negotiate a return to the status quo ante bellum. In the autumn of 1568, the Swedish armies attacked Halland again and moved up towards Älvsborg with the intention of regaining control of the fortress and regaining access to the Øresund. After a tough siege, the Swedes regained control of Älvsborg in October 1568, but failed in their attempt against the fortress of Bohus.
At the beginning of 1569, the Swedes were attacked in the Duchy of Livonia by the Kingdom of Poland and the Danish fleet, losing Reval in particular in the spring, while Hiiumaa was attacked and ravaged by the Danish fleet. In response to these attacks, the Prince Regent instructed Swedish commanders to attack Skåne and threaten Malmö, while he had forces prepared in the Duchy of Finland to counter the Danish-Polish attack in the Duchy of Estonia and instructed August Klas Horn to attack the Danish, Lübeck and Polish coasts during the summer. In the summer of 1569, the Swedes attacked Skåne again and advanced on Malmö with the intention of threatening and taking it. They laid siege to Malmö from August 1569, but had to give up in October 1569 and retreat to the north, not without sacking the region.
Klas Horn's naval campaign culminated in the Battle of Danzig, where he surprised the Danish and Polish ships present and ravaged some of them. The Swedish commander led an attack against Ösel in the autumn of 1569, forcing Magnus of Holstein to negotiate with the Swedish commander. At the same time, a Swedish army left the Duchy of Finland to regain control of the Duchy of Estonia, confronting the Poles and their allies near Kiiu in November 1569. The battle was brutal, but saw the Poles repel the Swedes.
On the diplomatic front, the kingdom maintained complex relations with the Kingdom of Norway: while religious differences and past quarrels were at the heart of antagonisms between the two kingdoms, John II's support for Eric XIV to counter Frederick II enabled the two kingdoms to have somewhat calmer relations and ensured that the Swedes maintained trade relations with the Norwegians despite Frederick II's determination to isolate Sweden and bring it down. Eric XIV received mediation from representatives of Emperor Maximilian II and Charles Dancay sent by Charles IX of France to settle the conflict with Frederick II. Maximilian II's representatives demanded the return of the Livonian territories conquered at the beginning of the decade, which Eric XIV and his advisors refused.
The overthrow of Eric XIV and the establishment of a regency in the name of Gustav II led to a certain evolution in the diplomatic approach, with Prince Charles seeking to negotiate peace with Frederick II and having to manage the latter's alliance with the Kingdom of Poland. He turned to Emperor Maximilian II to obtain arbitration in the conflict and force Frederick II to negotiate a return to the status quo ante bellum. The Regent maintained relations with John II of Norway despite their religious differences, the threat of Frederick II ensuring that a relationship of interest was maintained. He also undertook to forge relations with some of the princes of the empire and to renew ties with the county of East Frisia. From the winter of 1569, he undertook peace negotiations with Frederick II on behalf of Gustav II.
The Kingdom of Denmark was involved in its war against the Kingdom of Sweden in the late 1560s, as Frederick II sought to bring down his neighbour and rival in the Baltic Sea. However, the Danish king had to manage the financial cost of the conflict, which limited his ability to act militarily, his main military forces being the mercenaries he hired to wage his campaigns. He maintained good relations with the royal council, working with it to continue hostilities with Eric XIV.
In the spring of 1565, he commissioned Daniel Rantzau to lay siege to Kalmar and its fortress while the city was under naval blockade. The Danes laid siege to the city and its fortress in May 1565, but had to lift the siege as Eric XIV's army approached. Daniel Rantzau retreated to Skåne, but had to confront Eric XIV near Hagby at the end of May 1565. Outnumbered, the Danish commander managed to counter the Swedish attacks and used the numerical advantage of his cavalry to outflank his opponent and force him to retreat. Despite this success, the Danes suffered heavy losses and had to withdraw. In June 1565, their fleet repelled an attack by Jacob Kragge, although it suffered some notable losses. In the autumn of 1565, the Danish provinces of Blekinge and Skåne were attacked and ravaged by the Swedes.
In the spring of 1566, the Danes regained control of Scania and Blekinge, but had to abandon a new attack on Kalmar because of the financial cost of recruiting and maintaining mercenary armies. In the summer of 1566, their fleet and that of Lübeck suffered a major defeat near Öland, weakening their blockade on the kingdom. A storm scattered and ravaged the rest of their fleet, further weakening their naval advantage. In the autumn of 1566, they suffered a Swedish attack in Halland. Daniel Rantzau was given the task of defeating the opposing army following the news of the destruction of Falkenberg and the fall of Varberg. He confronted the Swedes at the beginning of November 1566 south of Kungsbacka. Daniel Rantzau succeeded in defeating the Swedes, but was unable to prevent their army from retreating and again suffered heavy losses in the confrontation.
Due to the financial cost of the conflict and the difficulty of maintaining mercenaries, Frederick II was forced to delay preparations for new military campaigns until spring 1567, with skirmishes and raids by both himself and the Swedes during this period. The Danish fleet, on the other hand, suffered several setbacks during the summer of 1567, which destroyed the blockade around Sweden, while the Øresund was blocked by the Swedes, hindering Danish trade in the Baltic and North Seas. In the autumn of 1567, Daniel Rantzau was commissioned to attack Stockholm to bring down the kingdom and put an end to the conflict. The Danes crossed Småland and Östergötland, laying waste to the region as they went. Daniel Rantzau and his forces swept through several small Swedish armies and sought to close in on Stockholm to capture it and bring down Eric XIV. Having sacked Norrköping, the approach of a large Swedish army and the payment constraints associated with being mercenaries forced Rantzau to abandon his plans and retreat south. In November 1567, the Swedes tried to trap him at Lake Sommen, but Daniel Rantzau managed to cross it while his rearguard held back his adversaries. He returned to Halland in January 1568 with what remained of his army.
At the beginning of 1568, Frederick II reorganised his forces while dealing with the financial aftermath of the conflict. In late spring 1568, he learned of the overthrow of Eric XIV and the establishment of a regency in the name of the new king, Gustav II, while the regent of the kingdom of Sweden sent ambassadors to negotiate an end to the conflict. However, Frederick II tried to exploit the internal Swedish situation by seeking the support of the Kingdom of Poland in Livonia, aware that he was no longer really in a position to exploit the situation to his advantage, delaying the possibility of negotiating peace with his adversaries. After initial unsuccessful contacts, Frederick II managed to obtain the support of Sigismund II, taking advantage of his hostility to Swedish influence in the Baltic Sea and Livonia. In July 1568, his representatives signed the Treaty of Stettin with Sigismund II, in which both parties agreed to divide the Swedish territories in Livonia, with the northern part going to Magnus of Holstein and the southern part to the Polish kingdom. This treaty led to a breakdown in trade with the Swedes, who did not appreciate Frederick II's attempts to bring them to their knees. In the autumn of 1568, Halland came under violent attack from the Swedes, forcing the Danes to recruit new forces to retake these territories at the beginning of 1569, while the Swedes successfully retook Älvsborg in November 1568. In the spring of 1569, Frederick II tasked part of his reconstituted fleet with attacking the Swedish possessions in Livonia and supporting the Polish attack. Daniel Rantzau was tasked with recapturing Halland and Älvsborg from the Swedes. The Danish expedition to Livonia was initially a success, allowing the Poles to take Revel in April 1569, while the Danes attacked the island of Hiiumaa in May 1569. However, the Danes and their allies had to contend with August Klas Horn's naval attacks, particularly at the Battle of Danzig, where the Swedish admiral destroyed part of the Danish-Polish fleet that was there. In the summer of 1569, Skåne came under violent attack and Malmö was besieged between August and October 1569, although its defence and maritime supplies prevented the Swedes from taking it. The attack forced Frederick II to send Daniel Rantzau to protect Malmö and regain control of Skåne, forcing him to abandon plans to retake Varberg. In the autumn of 1569, Ösel was attacked by the Swedish fleet, while an armed force from the Duchy of Finland reached the Duchy of Estonia to regain control. Magnus of Holstein was forced to deal with the Swedish attack on his estate. Although his financial situation was complicated and his kingdom was being ravaged by the Swedes in Skåne, Halland and Blekinge on land and on the coast by their fleet, Frederick II decided to resume negotiations in the winter of 1569.
On the diplomatic front, Frederick II maintained tense relations with John II, especially when he heard rumours of Norwegian mercenaries supporting the Swedes. He maintained good relations with Lübeck, which was his ally against the Kingdom of Sweden, the Duchy of Prussia and the Kingdom of Poland, which he managed to involve in the conflict against his neighbour from the end of 1568. However, the Danish sovereign received mediation from Emperor Maximilian II and Charles IX to resolve his conflict with Eric XIV, and then the regent Charles.
From a dynastic point of view, the sovereign and his wife Anne of Saxony had several children during this period: Anne born in 1564, Christian in 1566, Sophie in 1567 and Agnes in 1569. His wife, however, was affected by the news of her father's death in 1567 and went through a period of depression, which faded with difficulty with her husband and exchanges with Elizabeth Tudor.
During the late 1560s, the Kingdom of Norway remained neutral in the conflict between its neighbours, but watched events closely and vigilantly. While maintaining a certain neutrality, John II drew closer to the kingdom of Sweden, despite his mistrust and reluctance to support a Lutheran kingdom, as the fear of seeing Frederick II win and turn to his own kingdom was of great concern to the king and his advisers. This led John II to develop trade with the Kingdom of Sweden via circuitous routes in the north and to provide subsidies to enable Eric XIV to continue financing the war against his adversary. However, the King of Norway was disgusted by the news of the death of the King's brother, questioning the King's ability to continue to reign. Relations with the Kingdom of Denmark were tense and conflictual, leading the sovereign to task his fleet with guarding the coast and protecting merchant ships from pirate attacks or Danish ships in the North Sea.
Despite the unrest resulting from the conflict between its Scandinavian neighbours, the Kingdom of Norway continued to develop, taking advantage of its access to the North Sea to pursue and deepen its trade links with the British Isles and the Spanish Netherlands, even though in the latter case, unrest involving the Malcontents helped to threaten trade. The Kingdom of Norway also continued to strengthen its ties with Iceland to develop its presence in the North Sea, but also towards Greenland to reinforce their sovereignty over this territory and avoid the ambitions and claims of neighbouring kingdoms. By maintaining trade in the North Sea, the kingdom was able to maintain its economic prosperity and grow stronger at a time when its two neighbours and rivals were tearing each other apart.
In 1569, John II decided to prepare an expedition to explore the coasts of Greenland and find a north-west passage to Asia. He chose Enno Brandrøk as expedition leader and gave him the task of consolidating Norwegian authority over Greenland and exploring the coasts of the New World and finding a passage to Asia.
During this period, John II consolidated his authority but worked to maintain the confidence of his advisors and the loyalty of the clergy and the new Norwegian nobility, having heard rumours of Eric XIV's madness. Seeking to strengthen his kingdom by various means, he renovated the Landelove set up by his father to reinforce his authority. The sovereign also drew inspiration from neighbouring courts, particularly his imperial cousin Maximilian II and the English court of Mary I, to bring a new lustre and prestige to his kingdom.
On a religious level, the conflict between the kingdom of Sweden and that of Denmark and the threat posed by Frederick II of Denmark enabled John II to neutralise the spread of Lutheran and Calvinist ideas, in particular by allowing Norwegian Protestants to support the Swedes, while prohibiting any support for Denmark to avoid any attempt to destabilise his kingdom. However, the King of Norway continued to fight against Lutheran and Calvinist influence, maintaining the Norwegian clergy in an important position in the running of his kingdom while working to strengthen its influence, leading to growing opposition from the main members of the Norwegian clergy.
In the diplomatic sphere, John II maintained a relationship of interested neutrality with Eric XIV, then with the regent Charles Vasa to counter the threat posed by Frederick II of Norway in the context of the conflict between the Kingdom of Sweden and that of Denmark. The King of Norway maintained good relations with the British kingdoms and the Kingdom of Spain, although the troubles in the Spanish Netherlands affected trade. His relations with the princes of the empire were complex, with important links with some of the Catholic princes, while his relations with the Lutheran princes were more measured and cautious. Finally, he forged relations with the French crown.