Dragoons were originally a class of mounted infantry, who used horses for mobility, but dismounted to fight on foot. From the early 17th century onward, dragoons were increasingly also employed as conventional cavalry and trained for combat with swords and firearms from horseback. While their use goes back to the late 16th century, dragoon regiments were established in most European armies during the 17th and early 18th centuries; they provided greater mobility than regular infantry but were far less expensive than cavalry.
The name reputedly derives from a type of firearm, called a dragon, which was a handgun version of a blunderbuss, carried by dragoons of the French Army.
The title has been retained in modern times by a number of armoured or ceremonial mounted regiments.
The establishment of dragoons evolved from the practice of sometimes transporting infantry by horse when speed of movement was needed. In 1552, Alexander Farnese, Duke of Parma mounted several companies of infantry on pack horses to achieve surprise, another example being that used by Louis of Nassau in 1572 during operations near Mons in Hainaut, when 500 infantry were transported this way. It is also suggested the first dragoons were raised by the Marshal de Brissac in 1600. According to old German literature, dragoons were invented by Count Ernst von Mansfeld, one of the greatest German military commanders, in the early 1620s. There are other instances of mounted infantry predating this. However Mansfeld, who had learned his profession in Hungary and the Netherlands, often used horses to make his foot troops more mobile, creating what was called an "armée volante" (French for flying army).
During the Spanish Conquest of Peru in the 16th century, conquistadors fought on horse with arquebuses, prefiguring the origin of European dragoons.
The name possibly derives from an early weapon, a short wheellock, called a dragon because its muzzle was decorated with a dragon's head. The practice comes from a time when all gunpowder weapons had distinctive names, including the culverin, serpentine, falcon, falconet, etc.