Conflicts in 1631

The Battle of Werben took place during the Thirty Years' War on 7 August 1631 (N.S.), between the Swedish Empire and the Holy Roman Empire. The Swedes had 15,100 soldiers and were led by Gustavus Adolphus, while the Imperialists had 16,200 soldiers and were led by Field-Marshal Count Tilly. Tilly's troops attacked Gustavus' entrenchments in front of Werben (Elbe), but Swedish batteries and the cavalry under Wolf Heinrich von Baudissin forced them to retreat, at the cost of 6,000 Imperials and 200 Swedes.

The Battle of Dalinghe (Chinese: 大凌河之役) was a battle between the Later Jin dynasty and the Ming dynasty that took place between September and November 1631. Later Jin forces besieged and captured the fortified northern Ming city of Dalinghe (大凌河; present-day Linghai) in Liaoning. Using a combined force of Jurchen and Mongol cavalry, along with recently captured Ming artillery units, the Later Jin khan Hong Taiji surrounded Dalinghe and defeated a series of Ming reinforcement forces in the field. The Ming defenders under general Zu Dashou surrendered the city after taking heavy losses and running out of food. Several of the Ming officers captured in the battle would go on to play important roles in the ongoing transition from Ming to Qing. The battle was the first major test for the Chinese firearms specialists incorporated into the Later Jin military. Whereas the Later Jin had previously relied primarily on their own Eight Banners cavalry in military campaigns, after the siege of Dalinghe the Chinese infantry would play a larger role in the fighting. Unlike Nurhaci's failed siege at the Battle of Ningyuan several years prior, the siege of Dalinghe was a success that would soon be replicated in Songshan and Jinzhou, paving the way for the establishment of the Qing dynasty and the ultimate defeat of the Ming.

The War of the Mantuan Succession, from 1628 to 1631, was caused by the death in December 1627 of Vincenzo II, last male heir from the House of Gonzaga, long-time rulers of Mantua and Montferrat. These territories controlled the Spanish Road, a route that allowed Habsburg Spain to move recruits and supplies from Italy to their army in Flanders. It resulted in a proxy war between the French-backed Duke of Nevers, and the Duke of Guastalla, supported by Spain. It is considered a related conflict of the 1618 to 1648 Thirty Years' War.

The naval Battle of the Abrolhos took place on 12 September 1631 off the coast of Pernambuco, Brazil, during the Eighty Years' War. A joint Spanish-Portuguese fleet under admiral Antonio de Oquendo defeated the Dutch after a six-hour naval battle.

The sack of Magdeburg, also called Magdeburg's Wedding (German: Magdeburger Hochzeit) or Magdeburg's Sacrifice (Magdeburgs Opfergang), was the destruction of the Protestant city of Magdeburg on 20 May 1631 by the Imperial Army and the forces of the Catholic League, resulting in the deaths of around 20,000, including both defenders and non-combatants. The event is considered the worst massacre of the Thirty Years' War. Magdeburg, then one of the largest cities in Germany, having well over 25,000 inhabitants in 1630, did not recover its importance until well into the 18th century.

The Battle of Breitenfeld (German: Schlacht bei Breitenfeld; Swedish: Slaget vid Breitenfeld) or First Battle of Breitenfeld (in older texts sometimes known as Battle of Leipzig), was fought at a crossroads near Breitenfeld approximately 8 km north-west of the walled city of Leipzig on 17 September (Gregorian calendar), or 7 September (Julian calendar, in wide use at the time), 1631. A Swedish-Saxon army led by King Gustavus Adolphus of Sweden and Saxon Elector John George I defeated an Imperial-Catholic League Army led by Generalfeldmarschall Johann Tserclaes, Count of Tilly. It was the Protestants' first major victory of the Thirty Years War.

The Maldivian–Portuguese conflicts were a series of military engagements between the Kingdom of Portugal and the Sultanate of the Maldive Islands from 1521 to 1650.

The Battle of Frankfurt an der Oder on 13 April 1631 took place during the Thirty Years' War. It was fought between the Swedish Empire and the Holy Roman Empire for the strategically important, fortified Oder crossing Frankfurt an der Oder, Brandenburg, Germany.

The naval Battle of the Slaak (12 and 13 September 1631) was a Dutch victory during the Eighty Years' War. The Dutch prevented the Spanish army from dividing the Dutch United Provinces in two.

The Battle of Zhyryshty Crossing was fought in October 1731 between the forces of Grand Kabarda and the Crimean Khanate. It was part of the larger Crimean-Circassian Wars, where the Crimean Khanate attempted to subjugate the independent Kabardian principalities. The battle resulted in a decisive Kabardian victory, forcing the Crimean forces to retreat across the Terek River.