Crossbow

Lore & Background

The earliest known crossbows were invented in ancient China in the first millennium BCE and brought about a major shift in the role of projectile weaponry in wars, especially during Qin's unification wars and later the Han campaigns against northern nomads and western states. The medieval European crossbow was called by many names, most derived from the word ballista, an ancient Greek torsion siege engine similar in appearance but different in design principle. The Greek crossbow was likely invented independently of the Chinese crossbow.

Crossbows and bows use the same elastic launch principles, but differ in that an archer using a bow must draw-and-shoot in a quick and smooth motion with limited or no time for aiming, while a crossbow's design allows it to be spanned and cocked ready for use at a later time. Crossbows are spanned using techniques and devices such as levers, belt hooks, pulleys, windlasses, and cranequins to overcome very high draw weight. These advantages are offset by the longer time needed to reload a crossbow for further shots. Medieval crossbows were also very inefficient, with short shot stroke lengths and slower speeds of their steel prods and heavy strings, despite massive draw weights.

Chinese crossbow prods were made of composite material from the start. European crossbows from the 10th to 12th centuries used wood for the bow, often ash or yew. Composite bows started appearing in Europe during the 13th century, made from layers of wood, horn, and sinew. Steel prods came into use around the 14th century. The Chinese used winches for large crossbows mounted on fortifications or wagons, known as 'bedded crossbows'.

Reader's Guide

The crossbow's significance lies in its mechanical advantage, which allowed less familiarised and trained personnel to achieve effective use compared to the extensive practice required for bows like the English longbow or steppe nomad bows. Its trigger-released cocking mechanism enabled crossbows to be carried cocked and ready, affording users time to aim and allowing groups to operate in succession—one person shooting while others reload. This changed battlefield dynamics, particularly in ancient China during Qin unification wars and Han campaigns. In medieval Europe, the crossbow appeared in various forms, with names derived from the ballista. Despite its slower reload and inefficiency compared to later designs, the crossbow persisted as a weapon of war until firearms largely supplanted it. In modern times, crossbows remain widely used for competitive shooting sports, hunting, and relatively silent shooting. The terminology surrounding the crossbow includes varied historical usage: 'arbalist' could refer to the weapon, its user, or its maker, depending on the source. The construction evolved from simple wooden prods to composite and steel prods, with spanning mechanisms ranging from simple hand-drawing to complex winches and windlasses.

Did You Know?

• The Chinese trigger mechanism was typically composed of three cast bronze pieces housed inside a hollow bronze enclosure.
• The term 'prod' for the bow came into usage in the 19th century as a result of mistranslating 'rodd' in a 16th-century list of crossbow effects.