What campaign by Sweden led to Denmark losing a third of its territory with the treaty of  Treaty of Roskilde?
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Treaty of Roskilde The Treaty of Roskilde was concluded on 26 February (OS) or 8 March 1658 (NS) during the Second Northern War between Frederick III of Denmark–Norway and Charles X Gustav of Sweden in the Danish city of Roskilde. After a devastating defeat, Denmark-Norway was forced to give up a third of its territory to save the rest, the ceded lands comprising Blekinge, Bornholm, Bohuslän (Båhuslen), Scania (Skåne) and Trøndelag, as well as her claims to Halland.
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March Across the Belts The March Across the Belts was a campaign between 30 January and 8 February 1658 during the Second Northern War where King Charles X Gustav of Sweden led the Swedish army from Jutland across the ice of the Little Belt to Funen and the Great Belt to reach Zealand. The risky but vastly successful crossing was a crushing blow to Denmark, and led to the Treaty of Roskilde later that year, which handed Scania to Sweden.
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War against Sigismund The war against Sigismund (Swedish: "Kriget mot Sigismund" ) was a war between Duke Charles, later King Charles IX and Sigismund, King of Sweden and Poland. Lasting from 1598 to 1599, it is also called War of Deposition against Sigismund, since the focus of the conflicts was the attempt to depose the latter from the throne of Sweden. The war eventually resulted in the deposition of Sigismund, with Duke Charles taking over the government and later also acceding to the throne.
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Estonian War of Independence The Estonian War of Independence (Estonian: "Vabadussõda" , literally "Freedom War"), also known as the Estonian Liberation War, was a defensive campaign of the Estonian Army and its allies, most notably the White Russian Northwestern Army, Latvia, and the United Kingdom, against the Soviet Western Front offensive and the aggression of the "Baltische Landeswehr". It was fought in connection with the Russian Civil War during 1918–1920. The campaign was the struggle of Estonia for its sovereignty in the aftermath of World War I. It resulted in a victory for the newly established state and was concluded in the Treaty of Tartu.
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Battle of Kolding (1644) The Battle of Kolding was a battle between Swedish and Danish cavalry near Kolding, in Denmark. It was a decisive victory for the Swedes.
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Joachim Gersdorff Joachim Gersdorff (12 November 1611 - 19 April 1661) was a Danish politician, from 1650 to 1660 Steward of the Danish Realm. It was Gersdorff who negotiated the Treaty of Roskilde on Denmark's part during the Second Northern War, a war he had himself been in favour of entering. The treaty, which was concluded in Roskilde on 8 March 1658 (NS), ceded Scania, Halland, Blekinge and Bornholm to Sweden.
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Battle of Fraustadt The Battle of Fraustadt was fought on 2 February 1706 (O.S.) / 3 February 1706 (Swedish calendar) / 13 February 1706 (N.S.) between Sweden and Saxony-Poland and their Russian allies near Fraustadt (now Wschowa) in Poland. During the Battle of Fraustadt on February 3, August II was only 120 km away, with a cavalry force about 8,000 men strong. That was one of the main reasons that Swedish General Rehnskiöld hurried to engage Schulenburg. The battle is an example of a successful pincer movement and was one of Sweden's greatest victories in the Great Northern War.
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Battle of Stångebro The Battle of Stångebro, or the Battle of Linköping, took place at Linköping, Sweden, on 25 September 1598 (O.S.) and effectively ended the personal union between Sweden and the Polish–Lithuanian Commonwealth, that had existed since 1592. In the battle, an army of c. 8 ,000–12,000 commanded by Duke Charles defeated a mixed force of c. 5,000–8,000 consisting of an invading army of mercenaries in the king's employ and diverse but poorly co-ordinated supporting Swedish noblemen's forces commanded by King of both Sweden and the Polish–Lithuanian Commonwealth Sigismund III Vasa, who was acting to maintain and restore his personal union against anti-Catholic forces in Lutheran Sweden. The Swedish kings general Constantin fought at the western bridge.
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Battle of Fehrbellin The Battle of Fehrbellin was fought on June 18, 1675 (Julian calendar date, June 28th, Gregorian), between Swedish and Brandenburg-Prussian troops. The Swedes, under Count Waldemar von Wrangel (stepbrother of "Riksamiral" Carl Gustaf Wrangel), had invaded and occupied parts of Brandenburg from their possessions in Pomerania, but were repelled by the forces of Frederick William, the Great Elector, under his "Feldmarschall" Georg von Derfflinger near the town of Fehrbellin. Along with the Battle of Warsaw (1656), Fehrbellin was crucial in establishing the prestige of Frederick William and Brandenburg-Prussia's army.
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Second Archipelago Expedition The Second Archipelago Expedition was an expedition by the Russian Baltic Fleet under Admiral Dmitry Senyavin into the Mediterranean between 1805 and 1807. It formed part of the War of the Third Coalition, War of the Fourth Coalition and the Russo-Turkish War (1806-1812). The Russian fleet defeated the Turkish fleet in the Dardanelles and at the Battle of Athos and - in combination with Russian land successes on the Danube and in the Caucasus - the campaign forced the Ottomoan Empire to conclude a truce with Russia in August 1807. After the conclusion of the Peace of Tilsit with Napoleon, the Russian Navy lifted its blockade of the Dardanelles and returned to the Baltic.
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Battle of Bornholm (1676) The battle of Bornholm was a naval battle between a superior Swedish and a smaller Danish-Dutch fleet that was fought 25–26 May 1676 as a part of the Scanian War. The objective for both sides was naval supremacy in the southern Baltic Sea. The Swedish commander Lorentz Creutz sought to destroy the allied fleet and then land reinforcements in Swedish Pomerania to relieve the Swedish forces in northern Germany. The aim of the Danish fleet under Niels Juel was to prevent this reinforcement without being destroyed by the superior numbers of the Swedish forces.
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Battle of Nisko The Battle of Nisko took place on March 28, 1656, and was one of battles of the Swedish invasion of Poland. It resulted in a victory of Swedish forces, commanded by King Charles X Gustav.
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Battle of Langnes The Battle of Langnes, or the Battle of Langnes Entrenchment, was a battle fought between Norway and Sweden as a part of the Swedish-Norwegian War of 1814. The battle, even as it ended inconclusively, served as a tactical victory to the Norwegians since they now could avoid an unconditional surrender to the Swedish.
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Kexholm County Kexholm County (Swedish: "Kexholms län" , Finnish: "Käkisalmen lääni" ) was a county of the Swedish Empire from 1634 to 1721, when the southern part was ceded to the Russian Empire in the Treaty of Nystad. The capital of the county was Kexholm (Finnish: "Käkisalmi" ), which today is Priozersk.
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Battle of Oposhnya The Battle of Oposhnya was a battle which took place on February 8, 1709 during the Swedish invasion of Russia in the Great Northern War. After the costly siege of Veprik the Swedes under Charles XII of Sweden started an offensive against the Russian army in the area. The intention of this offensive was not clear to the Russians, as they subsequently had to spread their main forces out to cover possible attack directions. One of these were the troops under Aleksandr Danilovich Menshikov positioned at Oposhnya on the river Vorskla to block any attempt by the Swedes to cross the river. Charles intended to attack Menshikov and his 6,000 cavalry in a surprising manner, forcing them off the location. He led 2,000 cavalry for this task and managed to catch the Russians completely by surprise while having dinner. Charles immediately charged with his men and swept the Russian forces out of the town followed by a hot pursuit on step. In this action the Russians lost more than 450 men, the Swedes only 19. Perhaps more importantly however, the Swedes could now cross the river Vorskla. The offensive continued for a while and Charles reached Krasnokutsk where he forced another Russian army on the run.
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Treaty of Templin The Treaty of Templin was concluded on 24/25 November 1317, ending a war between the Margraviate of Brandenburg and Denmark, the latter leading a North German alliance. During this war, Brandenburgian margrave Waldemar (also Woldemar) and his troops were decisively defeated in the 1316 , fought at Schulzendorf between Rheinsberg and Gransee. After the battle, Brandenburg was forced to negotiate a truce. The treaty of Templin was signed a year later by Danish king Erich VI Menved, his ally duke Henry II of Mecklenburg ("the Lion"), and Waldemar.
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Russo-Swedish War (1788–1790) The Russo-Swedish War of 1788–90, known as Gustav III's Russian War in Sweden, Gustav III's War in Finland and Catherine II's Swedish War in Russia, was fought between Sweden and Russia from June 1788 to August 1790.
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Battle of Lier The Battle of Lier ("Slaget ved Lier") was fought on 2 August 1814 between Sweden and the newly independent Norway as part of the Swedish-Norwegian War of 1814. The battle was the first major action of the war, and the Norwegian victory served as an important part to boost morale among the Norwegian troops. This was the second time during the Napoleonic Wars that a battle had taken place at Lier, the first was in 1808.
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Stockholm Bloodbath The Stockholm Bloodbath (Swedish: Stockholms blodbad, Danish: Det Stockholmske Blodbad) took place on the invasion of Sweden by Danish forces under the command of King Christian II. The bloodbath was a series of events taking place between 7 and 9 November 1520, climaxing on 8 November, when around 80–90 people (mostly nobility and clergy supporting the Sture party) were executed, despite a promise by King Christian for general amnesty.
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Secret Treaty of Dover The Treaty of Dover, also known as the Secret Treaty of Dover, was a treaty between England and France signed at Dover on 1 June 1670. It required that Charles II of England would convert to the Roman Catholic Church and assist Louis XIV with 60 warships to help and 4000 soldiers in France's war of conquest against the Dutch Republic. In exchange, Charles would secretly receive a yearly pension of £230,000, as well as an extra sum of money when Charles informed the English people of his conversion, and France would send 6,000 French troops if there was ever a rebellion against Charles in England. The secret treaty was signed by Arlington, Arundell, Clifford and Bellings for England and Colbert de Croissy for France. Both kings exchanged letters of ratification and kept secret the existence of the treaty, A public treaty of Dover was also negotiated, but it was a fake designed for propaganda and to hide the religious dimension of the secret treaty. The Third Anglo-Dutch War was a direct consequence of this treaty. The actual treaty was published by historians a century later.
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Blockade of Stralsund The Blockade of Stralsund occurred during the Seven Years' War when a Prussian force invested the Swedish garrison of Stralsund, the capital of Swedish Pomerania. Rather than lay formal siege to the port, the Prussians cut it off by land and blockaded it. They were unable to cut it off by sea, owing to a lack of a Prussian fleet, and eventually the blockade was abandoned when the bulk of Prussian forces were withdrawn to fight in other theatres.
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Battle of Hjörungavágr The Battle of Hjörungavágr (Norwegian: Slaget ved Hjørungavåg) is a semi-legendary naval battle that took place in the late 10th century between the Jarls of Lade and a Danish invasion fleet led by the fabled Jomsvikings. This battle played an important role in the struggle by Haakon Sigurdsson to unite his rule over Norway.