It is known as chivalry to the body belonging to the army of a nation that is made up of soldiers mounted on horseback, that is, it is the force mounted combat horse.
Since time immemorial, human beings have used horses at the behest of combat, that is, for a strictly military purpose. In the ancient civilizations of Assyria, Babylon and Egypt, the horses were used to pull the armed chariots from which the javelins and arrows were thrown against the humanity of the enemy in question. Meanwhile, later, with the selection and breeding of much stronger breeds, the possibility of employing armed horsemen was enabled, making the use of the aforementioned war chariot obsolete.
In times of Roman empire the cavalry was used for exploration and as a relief assistant to the infantry, who was the one with the full weight of the battle; In these circumstances, the cavalry proposed rapid maneuvers in order to trap the enemy in its weak point; Alexander the Great, for example, he was a great promoter of the Cavalry.
On the other hand, in the Middle Ages, the cavalry was able to appear preferentially linked to the Feudalism.
And in more modern times, towards the seventeenth century, cavalry began to become lighter, that is, heavy armor, which in the past was the star, no longer had anything to do with pikes and arquebuses.
Another use of the term allows referring to quadruped animal that is used to ride.
Yet the medieval institution constituted with the objective of defending the faith and giving protection to the weakest, it was also called cavalry.