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
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.
In use since ancient times, the catapult has proven to be one of the most persistently effective mechanisms in warfare. In modern times the term can apply to devices ranging from a simple hand-held implement (also called a "
slingshot") to a mechanism for
launching aircraft from a ship.
The earliest catapults date to at least the 7th century BC, with King
Uzziah, of Judah, recorded as equipping the walls of Jerusalem with machines that shot "great stones". Catapults are mentioned in
Yajurveda under the name "Jyah" in chapter 30, verse 7. In the 5th century BC the
mangonel appeared in
ancient China, a type of
traction trebuchet and catapult. Early uses were also attributed to
Magadha in his, 5th century BC, war against the
Licchavis. Greek catapults were invented in the early 4th century BC, being attested by
Diodorus Siculus as part of the equipment of a Greek army in 399 BC, and subsequently used at the
siege of Motya in 397 BC.
The catapult and
crossbow in Greece are closely intertwined. Primitive catapults were essentially "the product of relatively straightforward attempts to increase the range and penetrating power of missiles by strengthening the bow which propelled them". The historian
Diodorus Siculus (fl. 1st century BC), described the invention of a mechanical arrow-firing catapult (katapeltikon) by a Greek task force in 399 BC. The weapon was soon after employed against
Motya (397 BC), a key
Carthaginian stronghold in
Sicily. Diodorus is assumed to have drawn his description from the highly rated history of
Philistus, a contemporary of the events then. The introduction of crossbows however, can be dated further back: according to the inventor
Hero of Alexandria (fl. 1st century AD), who referred to the now lost works of the 3rd-century BC engineer
Ctesibius, this weapon was inspired by an earlier foot-held crossbow, called the gastraphetes, which could store more energy than the Greek bows. A detailed description of the gastraphetes, or the "belly-bow",[page needed] along with a watercolor drawing, is found in Heron's technical treatise Belopoeica.
A third Greek author,
Biton (fl. 2nd century BC), whose reliability has been positively reevaluated by recent scholarship, described two advanced forms of the gastraphetes, which he credits to
Zopyros, an engineer from
southern Italy. Zopyrus has been plausibly equated with a
Pythagorean of that name who seems to have flourished in the late 5th century BC.[a] He probably designed his bow-machines on the occasion of the sieges of
Milet between 421 BC and 401 BC. The bows of these machines already featured a winched pull back system and could apparently throw two missiles at once.
Philo of Byzantium provides probably the most detailed account on the establishment of a theory of belopoietics (belos = "projectile"; poietike = "(art) of making") circa 200 BC. The central principle to this theory was that "all parts of a catapult, including the weight or length of the projectile, were proportional to the size of the torsion springs". This kind of innovation is indicative of the increasing rate at which geometry and physics were being assimilated into military enterprises.[page needed]
From the mid-4th century BC onwards, evidence of the Greek use of arrow-shooting machines becomes more dense and varied: arrow firing machines (katapaltai) are briefly mentioned by
Aeneas Tacticus in his treatise on siegecraft written around 350 BC. An extant inscription from the
Athenian arsenal, dated between 338 and 326 BC, lists a number of stored catapults with shooting bolts of varying size and springs of sinews. The later entry is particularly noteworthy as it constitutes the first clear evidence for the switch to
torsion catapults, which are more powerful than the more-flexible crossbows and which came to dominate Greek and
Roman artillery design thereafter. This move to torsion springs was likely spurred by the engineers of Philip II of Macedonia.[page needed] Another Athenian inventory from 330 to 329 BC includes catapult bolts with heads and flights. As the use of catapults became more commonplace, so did the training required to operate them. Many Greek children were instructed in catapult usage, as evidenced by "a 3rd Century B.C. inscription from the island of Ceos in the Cyclades [regulating] catapult shooting competitions for the young". Arrow firing machines in action are reported from
Philip II's siege of
Thrace) in 340 BC. At the same time, Greek fortifications began to feature high towers with shuttered windows in the top, which could have been used to house anti-personnel arrow shooters, as in
Aigosthena. Projectiles included both arrows and (later) stones that were sometimes lit on fire.[clarification needed]Onomarchus of Phocis first used catapults on the battlefield against
Philip II of Macedon. Philip's son,
Alexander the Great, was the next commander in recorded history to make such use of catapults on the battlefield as well as to use them during sieges.
The Romans started to use catapults as arms for their wars against
Syracuse, Macedon, Sparta and Aetolia (3rd and 2nd centuries BC). The Roman machine known as an
arcuballista was similar to a large crossbow. Later the Romans used
ballista catapults on their warships.
Other ancient catapults
In chronological order:
19th century BC, Egypt, walls of the fortress of
Buhen appear to contain platforms for siege weapons.
c.750 BC, Judah, King
Uzziah is documented as having overseen the construction of machines to "shoot great stones".
between 484 and 468 BC, India,
Ajatashatru is recorded in Jaina texts as having used catapults in his campaign against the
between 500 and 300 BC, China, recorded use of
mangonels. They were probably used by the
Mohists as early as the 4th century BC, descriptions of which can be found in the
Mojing (compiled in the 4th century BC). In Chapter 14 of the Mojing, the mangonel is described hurling hollowed out logs filled with burning charcoal at enemy troops. The mangonel was carried westward by the
Avars and appeared next in the eastern Mediterranean by the late 6th century AD, where it replaced torsion powered siege engines such as the ballista and onager due to its simpler design and faster rate of fire. The Byzantines adopted the mangonel possibly as early as 587, the Persians in the early 7th century, and the Arabs in the second half of the 7th century. The
Saxons adopted the weapon in the 8th century.
Castles and fortified
walled cities were common during this period and catapults were used as
siege weapons against them. As well as their use in attempts to breach walls,
incendiary missiles, or diseased carcasses or garbage could be catapulted over the walls.
Defensive techniques in the Middle Ages progressed to a point that rendered catapults largely ineffective. The
Viking siege of Paris (885–6 A.D.) "saw the employment by both sides of virtually every instrument of siege craft known to the classical world, including a variety of catapults", to little effect, resulting in failure.
The most widely used catapults throughout the Middle Ages were as follows:
Ballistae were similar to giant crossbows and were designed to work through torsion. The projectiles were large arrows or darts made from wood with an iron tip. These arrows were then shot "along a flat trajectory" at a target. Ballistae were accurate, but lacked firepower compared with that of a mangonel or trebuchet. Because of their immobility, most ballistae were constructed on site following a siege assessment by the commanding military officer.
The springald's design resembles that of the ballista, being a crossbow powered by tension. The springald's frame was more compact, allowing for use inside tighter confines, such as the inside of a castle or tower, but compromising its power.
This machine was designed to throw heavy projectiles from a "bowl-shaped bucket at the end of its arm". Mangonels were mostly used for “firing various missiles at fortresses, castles, and cities,” with a range of up to 1,300 ft (400 m). These missiles included anything from stones to excrement to rotting carcasses. Mangonels were relatively simple to construct, and eventually wheels were added to increase mobility.
Mangonels are also sometimes referred to as Onagers. Onager catapults initially launched projectiles from a sling, which was later changed to a "bowl-shaped bucket". The word Onager is derived from the Greek word onagros for "wild ass", referring to the "kicking motion and force" that were recreated in the Mangonel's design. Historical records regarding onagers are scarce. The most detailed account of Mangonel use is from “Eric Marsden's translation of a text written by Ammianus Marcellius in the 4th Century AD” describing its construction and combat usage.
Trebuchets were probably the most powerful catapult employed in the Middle Ages. The most commonly used ammunition were stones, but "darts and sharp wooden poles" could be substituted if necessary. The most effective kind of ammunition though involved fire, such as "firebrands, and deadly
Greek Fire". Trebuchets came in two different designs: Traction, which were powered by people, or Counterpoise, where the people were replaced with "a weight on the short end". The most famous historical account of trebuchet use dates back to the siege of
Stirling Castle in 1304, when the army of Edward I constructed a giant trebuchet known as
Warwolf, which then proceeded to "level a section of [castle] wall, successfully concluding the siege".
A simplified trebuchet, where the trebuchet's single counterweight is split, swinging on either side of a central support post.
Leonardo da Vinci's catapult
Leonardo da Vinci sought to improve the efficiency and range of earlier designs. His design incorporated a large wooden
leaf spring as an
accumulator to power the catapult. Both ends of the bow are connected by a rope, similar to the design of a
bow and arrow. The leaf spring was not used to pull the catapult armature directly, rather the rope was wound around a drum. The catapult armature was attached to this drum which would be turned until enough potential energy was stored in the deformation of the spring. The drum would then be disengaged from the winding mechanism, and the catapult arm would snap around. Though no records exist of this design being built during Leonardo's lifetime, contemporary enthusiasts have reconstructed it.
The SPBG (Silent Projector of Bottles and Grenades) was a soviet proposal anti-tank weapon that launched grenades from a spring loaded shuttle up to 100 m (330 ft).
In the 1840s, the invention of
vulcanizedrubber allowed the making of small hand-held catapults, either improvised from Y-shaped sticks or manufactured for sale; both were popular with children and teenagers. These devices were also known as
slingshots in the United States.
Special variants called
aircraft catapults are used to launch planes from land bases and sea carriers when the takeoff runway is too short for a powered takeoff or simply impractical to extend. Ships also use them to launch torpedoes and deploy bombs against submarines.[dubious –
discuss] Small catapults, referred to as "traps", are still widely used to launch
clay targets into the air in the sport of
clay pigeon shooting.
In the 1990s and early 2000s, a powerful catapult, a trebuchet, was used by thrill-seekers first on private property and in 2001–2002 at Middlemoor Water Park, Somerset, England, to experience being catapulted through the air for 100 feet (30 m). The practice has been discontinued due to a fatality at the Water Park. There had been an injury when the trebuchet was in use on private property. Injury and death occurred when those two participants failed to land onto the safety net. The operators of the trebuchet were tried, but found not guilty of manslaughter, though the jury noted that the fatality might have been avoided had the operators "imposed stricter safety measures."Human cannonballcircus acts use a catapult launch mechanism, rather than gunpowder, and are risky ventures for the human cannonballs.
Pumpkin chunking is another widely popularized use, in which people compete to see who can launch a pumpkin the farthest by mechanical means (although the world record is held by a pneumatic air cannon).
In January 2011, a homemade catapult was discovered that was used to
smugglecannabis into the United States from Mexico. The machine was found 20 ft (6.1 m) from the border fence with 4.4 pounds (2.0 kg) bales of cannabis ready to launch.