Una ballesta es un arma impulsora, consistente en un arco montado sobre una base recta que dispara proyectiles llamados saetas, a menudo también conocidos como pernos o virotes. Si bien se trata de un instrumento marcial muy antiguo, actualmente se siguen utilizando en la guerra, aunque principalmente con fines recreativos, como para el tiro al blanco y la caza. Pese a que la denominación actual se encuentra firme, la misma sufrió diversas variaciones a lo largo del tiempo y en la diversas culturas, como en el medioevo, en que recibió muchos otros nombres en su mayoría derivados de la palabra ballista.

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A crossbow is a type of weapon based on the bow and consisting of a horizontal bow-like assembly mounted on a stock. It shoots projectiles called bolts or quarrels. The medieval crossbow was called by many names, most of which were derived from the word ballista, a torsion siege engine resembling a crossbow. Historically, crossbows played a significant role in the warfare of East Asia, Europe, and the Mediterranean. The invention of the crossbow in ancient China caused a major shift in the role of projectile weaponry. The traditional bow and arrow had long been a specialized weapon which required a considerable degree of lifetime training, physical strength, and expertise to operate with any degree of efficiency. In many cultures, bowmen were considered a separate and superior caste, despite being usually drawn from the common class, as their archery skill-set was essentially developed from birth (similar to many horseman cultures) and was impossible to reproduce outside a pre-established cultural tradition, which many nations lacked. In contrast, the crossbow was the first projectile weapon to be simple, cheap, and physically undemanding enough to be operated by large numbers of conscript soldiers, thus enabling virtually any nation to field a potent force of ranged crossbowmen with little expense beyond the cost of the weapons themselves. In Europe, crossbows became widely used in the early medieval period, and this led to the ascendancy of large mercenary armies of crossbowmen (best exemplified by the Genoese crossbowmen), and the eventual demise of the heavily armored aristocratic knight, as armies became progressively dominated by conscripts equipped with increasingly powerful ranged projectile weapons. In modern times, crossbows have been largely supplanted by firearms in most roles but are still widely used for shooting sports, hunting, and when shooting in relative silence is an important consideration.

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