Historically, cavalry are soldiers or warriors who fight mounted on horseback. Until the 20th century cavalry were the most mobile of the combat arms, operating as light cavalry in the roles of reconnaissance, screening, and skirmishing in many armies, or as heavy cavalry for decisive shock attacks in other armies. An individual soldier in the cavalry is known by a number of designations depending on era and tactics, such as a cavalryman, horseman, trooper, cataphract, knight, drabant, hussar, uhlan, mamluk, cuirassier, lancer, dragoon, or horse archer. The designation of cavalry was not usually given to any military forces that used other animals for mounts, such as camels or elephants. Infantry who moved on horseback, but dismounted to fight on foot, were known in the early 17th to the early 18th century as dragoons, a class of mounted infantry which in most armies later evolved into standard cavalry while retaining their historic designation.

The Drabant Corps of Charles XII was the most prestigious unit in the Swedish Army during the time of the Great Northern War. As a result of the reforms of 1700, all personnel in the corps received an officer's rank with increased wages, while its size was eventually set at 168 men. Those serving as Drabants were almost exclusively recruited from the Swedish Empire, with most coming from Sweden. The corps was issued the finest weapons, horses, and clothing was often adorned with gold lacing. They fought according to the cavalry regulations of the Caroleans, emphasizing the cold-steel charge in slight wedge formations, knee behind knee, over the more common caracole. This strategy allowed them to function as a bodyguard for the king as well as an elite combat unit, often playing a crucial role in the battles despite their relatively small size. During the war, the corps frequently marched with the main army and the king, fighting in most battles.