Charles X Gustav, also Carl X Gustav, was King of Sweden from 1654 until his death. He was the son of John Casimir, Count Palatine of Zweibrücken-Kleeburg and Catherine of Sweden. After his father's death he also succeeded him as Pfalzgraf. He was married to Hedwig Eleonora of Holstein-Gottorp, who bore his son and successor, Charles XI. Charles X Gustav was the second Wittelsbach king of Sweden after the childless king Christopher of Bavaria (1441–1448) and he was the first king of the Swedish Caroline era, which had its peak during the end of the reign of his son, Charles XI. He led Sweden during the Second Northern War, enlarging the Swedish Empire. By his predecessor Christina, he was considered de facto Duke of Eyland (Öland), before ascending to the Swedish throne. From 1655 to 1657, he was also Grand Duke of Lithuania.
The Deluge was a series of mid-17th-century military campaigns in the Polish–Lithuanian Commonwealth. In a wider sense, it applies to the period between the Khmelnytsky Uprising of 1648 and the Truce of Andrusovo in 1667, comprising the Polish theatres of the Russo-Polish and Second Northern Wars. In a stricter sense, the term refers to the Swedish invasion and occupation of the Commonwealth as a theatre of the Second Northern War (1655–1660) only; in Poland and Lithuania this period is called the Swedish Deluge, or less commonly the Russo–Swedish Deluge due to the simultaneous Russo-Polish War. The term "deluge" was popularized by Henryk Sienkiewicz in his novel The Deluge (1886).
The Northern War of 1655–1660, also known as the Second Northern War, First Northern War or Little Northern War, was fought between Sweden and its adversaries the Polish–Lithuanian Commonwealth (1655–60), the Tsardom of Russia (1656–58), Brandenburg-Prussia (1657–60), the Habsburg monarchy (1657–60) and Denmark–Norway. The Dutch Republic waged an informal trade war against Sweden and seized the colony of New Sweden in 1655, but was not a recognized part of the Polish–Danish alliance.
The Count's Feud, sometimes referred to as the Count's War, was a Danish war of succession occurring from 1534 to 1536, which gave rise to the Reformation in Denmark. In the broader international context, it was a part of the European wars of religion. The Count's Feud derives its name from the Protestant Count, Christopher of Oldenburg, who championed the claim to the throne of the deposed Catholic King, Christian II, rejecting Christian III's election. Christian III was a devoted Protestant who had already established Lutheranism as the state religion in Schleswig and Holstein by 1528.
The March Across the Belts was a military campaign waged by the Swedish Empire across the ice between the Danish islands. It lasted between 30 January and 15 February 1658, ending with a decisive victory for Swedish King Charles X Gustav during his first Danish war.
The Dano-Swedish War of 1657–1658, known in Denmark as the First Karl Gustav War in Norway as Krabbes Feud and in Sweden as Karl Gustav's First Danish War, was a conflict between Sweden and Denmark–Norway during the Second Northern War. In 1657, Charles X of Sweden and his Swedish army were bogged down in Poland. Frederick III of Denmark-Norway saw an opportunity to recover the territories lost in 1645 and attacked Sweden. The outbreak of war with Denmark provided Charles with an excuse to withdraw from the Polish campaign and move against Denmark.
The Assault on Copenhagen also known as the Battle of Copenhagen on 11 February 1659 was a major engagement during the Second Northern War, taking place during the Swedish siege of Copenhagen.
The Battle of Żarnów was fought on September 16, 1655, between the forces of the Polish–Lithuanian Commonwealth, commanded by John II Casimir and the forces of the Swedish Empire, commanded by Charles X Gustav. The result ended with a Swedish victory.
The Dano-Swedish War of 1658–1660 was a war between Denmark–Norway and Sweden, with the former backed by the Dutch Republic and Poland. It is known in Denmark as the Second Karl Gustav War, in Norway as Bjelkes Feud in Sweden as Karl Gustav's Second Danish War, and in the Netherlands as the Swedish-Dutch War.
The relations between Denmark and Sweden span a long history of interaction. The inhabitants of each speak related North Germanic languages, which have a degree of mutual intelligibility. Both countries formed part of the Kalmar Union between 1397 and 1523, but there exists an inherited cultural competition between Sweden and Denmark. From 1448 to 1790 the two kingdoms went to war against each other at nearly every opportunity; in more than one case a new king tried to prove his worth by waging war on the other country for little or no political reason. Several Dano-Swedish wars took place between 1521 and 1814.
The Battle of Nyborg took place between Sweden and the combined forces of Denmark, Dutch naval forces under Michiel de Ruyter, troops of Brandenburg-Prussia, and Polish–Lithuanian Commonwealth forces under Stefan Czarniecki. The battle was engaged on 14 November 1659 at Nyborg on the Danish island of Funen. Nyborg was the final major battle of the Dano-Swedish War of 1658 to 1660.
The Landing at Humlebæk took place on August 4, 1700, in the Swedish invasion of Denmark during the Great Northern War 1700-1721. It was the first offensive during the war by the Swedish army, and it was directly led by Charles XII of Sweden commanding the right flank and Arvid Horn together with Carl Gustav Rehnskiöld at the left. The Swedes were victorious and routed the Danish forces led by Jens Rostgaard.
Battle of Skalat in 1657 was part of The Deluge.
The Invasion of Courland (1658) was a Swedish campaign against the Duchy of Courland in 1658. It was led by Robert Douglas and resulted in the Swedes occupying Courland, capturing Mitau and the Duke of Courland. The initial invasion only lasted a few months, however the Swedes remained in Courland for 2 years.
The Transylvanian campaign into Poland also called the Brest Campaign or Rakoczy's Campaign was a campaign by Transylvania, Sweden, and the Cossack Hetmanate into the Polish–Lithuanian Commonwealth during the Deluge in 1657. The allied army saw success in the beginning, but when Denmark declared war on Sweden, Charles abandoned the Transylvanians, which led to their defeat. During the campaign, the allied forces successfully managed to capture both Warsaw and Brest from the Poles but were later pushed out from the country after the forces of Stefan Czarniecki intervened in the conflict.
The siege of Fredriksodde, also called the storming of Fredriksodde, was a successful Swedish siege of the fortress and town of Fredriksodde in 1657 during the Dano-Swedish War (1657–1658). The siege and the subsequent capture of the fortress by Swedish forces completed the Swedish conquest of Jutland.
The Battle of Rautus kyrka was a failed Russian attempt to stop a Swedish relief force headed for Kexholm during the Russo-Swedish War (1656–1658). The Swedes, led by Christoffer Burmeister successfully repelled the Russian attack and forced them back.
The Assault on Eda skans was an incident on 11 February 1658, when a Norwegian force under Michael Opitz attacked the Swedish sconce at Eda. The Norwegians were successful at first, but were later repelled by the Swedish artillery fire, forcing them to withdraw. The fighting lasted for 2 hours.
The Battle of Lälitz was an engagement fought between Swedish and Russian troops in the village of Lälitz in 17 July, 1657. It ended with the Russian troops being repulsed and their commander dying of his wounds sustained during the fighting.
The Battle of Lava occurred on 11 August, 1657, when a Swedish force, under the command of Gustav Evertsson Horn, attacked a Russian ostrog at Lava. Horn, who had not been notified that Carl Gustaf Wrangel would not be able to support him, was not able to dislodge the Russians.
Swedish Empire 
Denmark–Norway 