A crossbow is a ranged weapon using an elastic launching device consisting of a bow-like assembly called a prod, mounted horizontally on a main frame called a tiller, which is hand-held in a similar fashion to the stock of a long gun. Crossbows shoot arrow-like projectiles called bolts or quarrels. A person who shoots crossbow is called a crossbowman, an arbalister or an arbalist.
A catapult is a ballistic device used to launch a projectile a great distance without the aid of gunpowder or other propellants – particularly various types of ancient and medieval siege engines. A catapult uses the sudden release of stored potential energy to propel its payload. Most convert tension or torsion energy that was more slowly and manually built up within the device before release, via springs, bows, twisted rope, elastic, or any of numerous other materials and mechanisms.
The ballista, plural ballistae or ballistas, sometimes called bolt thrower, was an ancient missile weapon that launched either bolts or stones at a distant target.
The mangonel, also called the traction trebuchet, was a type of trebuchet used in Ancient China starting from the Warring States period, and later across Eurasia by the 6th century AD. Unlike the later counterweight trebuchet, the mangonel operated on manpower-pulling cords attached to a lever and sling to launch projectiles.
A siege engine is a device that is designed to break or circumvent heavy castle doors, thick city walls and other fortifications in siege warfare. Some are immobile, constructed in place to attack enemy fortifications from a distance, while others have wheels to enable advancing up to the enemy fortification. There are many distinct types, such as siege towers that allow foot soldiers to scale walls and attack the defenders, battering rams that damage walls or gates, and large ranged weapons that attack from a distance by launching projectiles. Some complex siege engines were combinations of these types.
The onager was a Roman torsion-powered siege engine. It is commonly depicted as a catapult with a bowl, bucket, or sling at the end of its throwing arm. The onager was first mentioned in 353 AD by Ammianus Marcellinus, who described onagers as the same as a scorpion. The onager is often confused with the later mangonel, a "traction trebuchet" that replaced torsion powered siege engines in the 6th century AD.
Roman siege engines were, for the most part, adapted from Hellenistic siege technology. Relatively small efforts were made to develop the technology; however, the Romans brought an unrelentingly aggressive style to siege warfare that brought them repeated success. Up to the first century BC, the Romans utilized siege weapons only as required and relied for the most part on ladders, towers and rams to assault a fortified town. Ballistae were also employed, but held no permanent place within a legion's roster, until later in the republic, and were used sparingly. Julius Caesar took great interest in the integration of advanced siege engines, organizing their use for optimal battlefield efficiency.
A springald, or espringal, was a medieval torsion artillery device for throwing bolts. It is depicted in a diagram in an 11th-century Byzantine manuscript, but in Western Europe is more evident in the late 12th century and early 13th century. It was constructed on the same principles as an Ancient Greek or Roman ballista, but with inward swinging arms and threw bolts instead of stones. It was also known as a 'skein-bow', and was a torsion device using twisted skeins of silk or sinew to power two bow-arms.
The polybolos was an ancient Greek repeating ballista, reputedly invented by Dionysius of Alexandria and used in antiquity. The polybolos was not a crossbow since it used a torsion mechanism, drawing its power from twisted sinew-bundles. However the earlier and similar oxybeles employed a tension crosbow mechanism, before it was abandoned in favor of torsion.
The gastraphetes, also called belly bow or belly shooter, was a hand-held crossbow used by the Ancient Greeks. It was described in the 1st century AD by the Greek author Heron of Alexandria in his work Belopoeica, which draws on an earlier account of the famous Greek engineer Ctesibius. Heron identifies the gastraphetes as the forerunner of the later catapult, which places its invention some unknown time prior to c. 420 BC.
A lithobolos refers to any mechanical artillery weapon used and/or referred to as a stone thrower in ancient warfare. Typically this referred to engines that propel a stone along a flat track with two rigid bow arms powered by torsion, in particular all sizes of palintonon.
A catapulta was a Roman machine for throwing arrows and javelins, 12 feet (3.7 m) or 15 feet (4.6 m) long, at the enemy. The name comes from the Greek katapeltes (καταπέλτης), because it could pierce or 'go through' (kata) shields (peltas). The design was probably inherited, along with the ballista, from Greek armies. Some versions of the catapulta were portable. Smaller two-armed versions of the catapulta were known as scorpiones. The catapulta was made of wood and were placed on stands.
Petrary is a generic term for medieval stone-throwing siege engines such as mangonels and trebuchets, used to hurl large rocks against the walls of the besieged city, in an attempt to break down the wall and create an entry point. Catapult, trebuchet, and mangonel are all types of petrary, but ballista-style armaments, which shoot bolts or arrows, would not fit into this category.
The scorpio or scorpion was a type of Roman torsion siege engine and field artillery piece. It was described in detail by the early-imperial Roman architect and engineer Vitruvius in the 1st century BC and by the 4th century AD officer and historian Ammianus Marcellinus.
It is not clear where and when the crossbow originated, but it is believed to have appeared in China and Europe around the 7th to 5th centuries BC. In China the crossbow was one of the primary military weapons from the Warring States period until the end of the Han dynasty, when armies were composed of up to 30 to 50 percent crossbowmen. The crossbow lost much of its popularity after the fall of the Han dynasty, likely due to the rise of the more resilient heavy cavalry during the Six Dynasties. One Tang dynasty source recommends a bow to crossbow ratio of five to one as well as the utilization of the countermarch to make up for the crossbow's lack of speed. The crossbow countermarch technique was further refined in the Song dynasty, but crossbow usage in the military continued to decline after the Mongol conquest of China. Although the crossbow never regained the prominence it once had under the Han, it was never completely phased out either. Even as late as the 17th century AD, military theorists were still recommending it for wider military adoption, but production had already shifted in favour of firearms and traditional composite bows.
Epimachus of Athens was a renowned Athenian engineer and architect who is known to have constructed the Helepolis, a huge siege machine first conceptualised by Demetrius I of Macedon and built to be employed in the unsuccessful siege of Rhodes.
A torsion siege engine is a type of siege engine that utilizes torsion to launch projectiles. They were initially developed by the ancient Macedonians, specifically Philip II of Macedon and Alexander the Great, and used through the Middle Ages until the development of gunpowder artillery in the 14th century rendered them mostly obsolete.
Carroballista was an ancient, cart-mounted ballista, a type of mobile field artillery. According to the Roman author Vegetius, each legion had 55 carroballistae which were arrow/bolt-shooter of the cheiroballistra type. Vegetius tells us that each carroballista was carried by mules and operated by one contubernium. Surviving representation of a carroballista are from the bas-reliefs of Trajan's Column and the Column of Marcus Aurelius.
The torsion mangonel myth, or simply the myth of the mangonel, is the belief that the mangonel was a torsion siege engine which used the tension effect of twisted cords to shoot projectiles, and is considered by some to have been in use until the arrival of gunpowder artillery. Instead, the mangonel operated on manpower-pulling cords attached to a lever and sling to launch projectiles.
Siegecraft originated in Ancient Greece. This type of siege originated from the moment in which the stage of the mere siege was surpassed by an exceptional development of military techniques, which were hardly taken any further during the Middle Ages, until the invention of firearms. The importance of siege techniques was due to the increase in the strategic role of the city to the detriment of the territory in the overall defense of the polis.
Greek non-torsion siege crossbow ( gastraphetes)
Hellenistic era artillery tower with arrow shooters (euthytona) and stone throwers (palintona)
Hellenistic era semi-automatic bolt shooter ( polybolos )
Roman imperial era bolt shooter (scorpio) bastion in defensive warfare
Roman imperial era mobile field artillery (carroballistae)
Handheld Roman imperial era manuballista or cheiroballistra
Late Roman era stone thrower (onager) used predominantly in sieges
