Crossbow

An Arbalast Crossbow with an iron prod. Note the iron stirrup ring on the front; which the user could use in this case to hold down with his foot when pulling back the draw string or mounting a gaffe lever to push the string back

"I waste him with my crossbow!"

– Bob Herzog, Knights Of The Dinner Table

The crossbow is named for its cross-shaped design, as it is basically a bow (in technical terms, called a prod) on a stock (alternatively called a tiller) that uses a locking trigger mechanism to hold and fire either an arrow (called a bolt or quarrel) or a small spherical stone or lead bullet (the latter usually being used for hunting). Bolts are arrows with a shorter shaft, and could range from being lighter than an average arrow to several times heavier. It operates on the same principle as the traditional bow in that a tough bowstring is pulled back to store potential energy in the bow, which upon release of the string, transfers it to a projectile.

While historians are unsure who first made the crossbow, the earliest known crossbows were found in China around 700 to 500 BCE. During the Warring States period, crossbows became a preferred ranged weapon of Chinese armies due to ease of use for conscripts and the use of crossbows certainly aided in the rise of the Qin Dynasty and the beginning of Imperial China. The Greeks and Romans experimented with hand-held crossbows, but they never made extensive use of them, although they did make extensive use of ballista (basically a crossbow scaled up to the size of an artillery piece, and often shot stone instead of scaled up arrows). The Chinese of these times, on the other hand, had crossbows of all types and shapes: from one-handed repeater crossbows, capable of launching dozens of (fairly weak, but often poisoned) arrows per minute, to absurdly heavy ones, designed to be pulled by legs, rather than arms, and launch arrows the size of small javelin, later with gunpowder-filled bombs on the heading at range, only rivaled by siege engines, though later they passed out in favor of multiple rocket launchers (yes, you read it right). Crossbows began to see widespread use in Europe around 1000 CE, at this time emerged crossbows with steel bow sections, more commonly called arbalasts.

The difference between a bow and a crossbow is that a bow's string needs to be pulled back and held by the user while aiming, while a crossbow has a mechanism that locks the bowstring in a readied state and only requires the user to operate the trigger to release the bolt upon sighting their target. The trigger mechanism evolved over time, as did aids for drawing the crossbow's string. The weight or size of the crossbow certainly had an effect on the mechanisms involved, as light crossbows could be reset by hand, but heavier version could end up using levers or crank-operated windlasses to pull back and cock the string, and tended to use more robust release mechanisms due to the increased stress involved.

In fantasy settings, technologically advanced races who don't (or in limitation) employ firearms as their go-to weapon typically make heavy use of crossbows. It is also the ranged weapon of choice for richer and more experienced mercenaries.

For some reason in a lot of fantasy and medieval fiction it seems to be the preferred ranged weapon of whoever the bad guys are. Examples include A Song Of Ice and Fire (where it seems to be the favorite weapon of King Joffrey), The Lord of the Rings (Uruk-Hai marksmen use crossbows) and different settings of DnD (Drow poisoned repeater crossbows). This may have something to do with crossbows being less relying on the wielder's strengths, stamina and personal skill, and thus regarded as "unfair" weapon compared to bow, it was at one point banned by the pope for use on Christians, although due to it's usefulness on the battlefield this was largely ignored.

The crossbow is also the favored ranged weapon of dwarves in most fantasy fiction, though in this case it may be more than just aesthetics; while it would be fitting for a race known for their technical expertise to use a more complex device, also keep in mind that dwarves would have a harder time using regular bows. A bow's power depends on its draw length, and having shorter arms, dwarves can't get as much power out of a bow. They also need a weapon that can be used more easily in confined spaces, which disqualifies longbows right away. What they do have going for them, though, is great strength, making a crossbow's high draw weight less of an issue for them.

Use in warfare

A major advantage of crossbows over regular bows is that because they're fired using a mechanism instead of depending on human strength to hold the bow in a ready-to-fire position, user fatigue is no longer such a huge factor Additionally, the heavier crossbows could generate more force than most humans thanks to the pulley systems used to cock the string, thus heavier bolts could be thrown, resulting in greater penetration of the target. Possibly its biggest advantage is that it was easier to train the use of a crossbow than bows since the weapon's operation is much less taxing.

Of course, the main drawback with crossbows is that they require a wider range of resources and skills to produce due to the mechanisms involved. Crossbows also generally have a lower rate of fire than bows. At best, a crossbowman can get off about eight shots a minute. More powerful arbalast crossbows that used windlasses could manage about three shots a minute, but could store more energy than a human could physically pull back with bare hands. For these reasons Crossbows excel in a siege situation where the ranges are long and you can duck into cover easily while you're reloading. And since sieges tended to be drawn-out affairs anyway, reload time wasn't as necessary.

That being said, despite crossbows being much more expensive than bows, they were much less demanding on user's skill and physique, meaning you can train as many crossbowmen as you have crossbows and replenish killed ones in just few months of training, while in order to train a bowmen you need to start with kids. So while a single bowman is much more effective than a single crossbowman, you can afford a half-dozen of crossbowmen for the cost of one bowman, and replace lost ones quickly as long as their weapon survives the battle. This is probably why they first took off in Warring States period China, where raising large conscript armies was the name of the game.

It should be noted that despite having much greater draw weights than contemporary bows (above 500 lbs in some cases), crossbows were not proportionally more powerful due to their very short draw length, translating into a much briefer energy transfer. More modern crossbows sometimes address this by using recurve bows, or even by using a bullpup configuration by turning the bow backwards and then pulling the string past the bow. Additionally, the reduced aerodynamic properties of crossbow bolts as compared to arrows mean that they very rapidly lose velocity after a relatively short distance, giving them great punch at short range but reduced effectiveness at longer ranges as compared to bows.

The fact that even relatively poorly trained men armed with crossbows could royally murder fully armored knights, made the crossbow one of the most hated pre-firearm weapons in the Europe, even more than the infamous flamberge. At some point it even came to the pope banning crossbows as unholy weapon not to be used on fellow Christians, but even then they remained popular among mercenaries, rich lords and Protestants. Proud knights could accept deaths from elite long/composite bowmen who like them were training from childhood, but not from some hastily drilled dirty peasant levies whose lord could afford few dozens of crossbows.

Crossbows are still occasionally used for military purposes; while a crossbow's bolts lack the stopping power of modern firearms, the bolts it fires are quieter than any "silenced" firearm and it can also be used for niche purposes such as launching grappling hooks or detonating tripwire-activated mines, and its lower projectile speed means it's much less likely to set off any worn explosives. While its comparatively lower ability to kill outright can be an issue you could use the same solution that the Indian Navy used for this problem and use Cyanide tipped bolts, or take the Rambo route and use bolts with explosive tips.

See Also: Crossbows are Underpowered in d20

Loading Mechanisms

Because later crossbows were often too tough to simply pull back unaided, a number of devices were invented to allow the wielder rearm the crossbow via pulling back the string (in a process called spanning). The device used usually depended upon the draw weight of the bow, as heavier bows would require more advanced devices that required more time to pull back.

• Gloves and Stirrup: Generally leather or some other material, good quality gloves (or some tough callouses) can save one some finger or palm bleeding from trying to pull it by the old fashioned way. Talking from experience, if one is to do it this way, put your entire upper back and arms into it, and pull. Either user placed both feet on the bow's span on each side of the stock or in the stirrup ring attached to the crossbow head. Most commonly associated way of reloading in popular culture besides the Cranequin and Windlass. First appearance: 700 to 500's BCE. Mechanical advantage: 1 to 1. Maximum draw weight: 150-300 lbs.
• Stirrup and Belt Hook: Most crossbows you see have a stirrup ring towards the front end for putting your foot through to hold it steady. Combined with a belt worn around the waist with a hook attached to it, the wielder could use their whole body, rather than just their arms, to arm the crossbow. Could also use a belt-attached pulley configuration to lessen the strength to draw. First appearance: 1200's. Mechanical advantage: about 2 or 1 to 1 (depending on whether using pulley configuration). Maximum draw weight: 320-450 lbs.
• Goat's Foot Lever: This was a fairly simple detachable metal lever that gave the user more leverage when pulling back the string. Composed of a rod attached to two curved prongs and two hinged hooks; it's shape had a resemblance to a goat's foot (obvious in the name). Mounts on two metal lugs on the body's sides near the trigger, pull drawstring back in one motion via two hinged hooks, place folded lever back on belt, load the bolt on the crossbow, and then shoot. This could arm the crossbow in a single motion with the lever's curved prongs making the drawing force decrease as the spanning distance increases. Very common for field portable bows and mounted crossbowmen. First appearance: Between 1300's to 1400's. Mechanical Advantage: from 5 up to 30 to 1 (depending on how far the lever is pulled). Maximum draw weight: 500-600 lbs.
• Gaffe Lever: a two piece wooden lever held by a hinge and attached to the stirrup ring via metal hook. User pushed down on the lever to push the drawstring into the trigger before removing. More associated with nobles for hunting or shooting clubs after the gunpowder weapons appeared in the 1500's during the Renaissance. First appearance: 1500's. Mechanical advantage: up to 30 to 1. Maximum draw weight: 400 lbs.
• Lever-Action/Self Spanning: Uses levers embedded into the crossbow body. The user unlocks catch holding the hinge firm before folding open the half of the crossbow body to catch the drawstring on a latch before pulling back to the trigger to arm the crossbow. Unlike the Asian equivalent in the Chu-Ko-Nu, these did not have a top magazine. This enabled users to aim after loading and pulling a trigger to shoot at the cost of having to load the bolt by hand. Besides the Scottish Border Reivers' latchet crossbow in the 1600's, two noted examples are Martin Löffelholz's armbrust in the Codex Löffelholz and Da Vinci's Balestra Veloce in the Codex Atlanticus. While impressive, lever-action crossbows were never mainstream or famous due to the transition to gunpowder weapons in the 1500's during the Renaissance. First appearance: 1500's. Mechanical advantage: up to 25 to 1. Maximum draw weight: 220 - 300 lbs.
• Windlass: Like the Cranequin, this was a winding device, but it also came with a bulky pulley system that was mounted to the back of the crossbow. As a result, this was a tremendously powerful pulling system at the expense of needing a lot of time to arm. Along with the Cranequin, this was one of the strongest crossbow loading methods. Contrary to popular culture, it was more often used on large, heavy crossbows for stationary battles like trench warfare or sieges like modern anti-tank guns. On the other hand, usage on open battlefields (behind pavise shields) for support artillery wasn't unheard of. First appearance: 1400’s. Mechanical advantage: ~160 to 1. Maximum draw weight: 1500 lbs+ (limited by time and bow strength).
• Cranequin: Also called the "Rack and Pinion," this device used gears and a crank to wind up the bowstring, requiring multiple turns to pull it all the way back. Device slid onto lugs mounted on the stock and was removed before firing. Along with the Windlass, this was one of the strongest crossbow loading methods. Contrary to popular culture, it was more often used on large, heavy crossbows for stationary battles like trench warfare or sieges like modern anti-tank guns. On the other hand, usage on mounted crossbowmen with lighter crossbows and by footmen on open battlefields (behind pavise shields) for artillery support wasn't unheard of. First appearance: 1500's. Mechanical advantage: ~600 or 840 to 1. Maximum draw weight: 2000 lbs+.

Types of Crossbows

As a general note, crossbows are not ballistas, despite their visual similarity. Unlike Crossbows which store energy in a set of arms which are bent back, Ballistas instead store energy in twisted rope that has a wooden beam pushed into it which is then twisted back farther before firing to store energy. That said, some ballistas are discussed here until a proper "siege" article is consolidated.

• Gastraphetes: an early Greek crossbow, the Gastraphetes, or "belly bow", was cocked by resting the stomach on the bolt rest of the stock (which contained a sliding plank attached to the drawstring) and pushing down so that more energy can be stored then an archer could provide. The Gastraphetes worked slightly different from the classic crossbow, in that its arrow slot was two-piece, with the sliding inner plank attached to the rope. Thus, rather than drawing back the crossbow, you readied it by slamming it into the ground until the trigger catches onto a latch. While impressive, it was restricted to hip fire, was fired with a button-like trigger, and was more of a man portable siege weapon. A larger winch-spanned, tripod-mounted version, the Oxybeles, was in use as a stationary artillery weapon before being replaced by the ballista.

• Polybolos: meaning “multi-bolt thrower” in Greek and also known as a repeating ballista, the Polybolos is more of a big cross bow since the arms are fixed to the "stock" and don't twist around to fire it. The repeating ballista was fired by turning a wheel connected to a chain back to cock it, the turning it the other way to load it again from a hopper on top of the stock.

• Chinese "Nu" crossbow: unlike the European crossbow, which had a power stroke (drawing span) of about 7 inches; used a rolling nut latch held in place by a sear pushed by a long horizontal lever-like trigger in the middle of the stock; and used prods (bow pieces) made from simple wood, composite, and later with metal; the Chinese crossbow had a power stroke of about 21 inches; used a complicated two-piece vertical trigger at the very back of the stock (held together by tension and two pins at the very end of the stock) on a pistol grip; and used wood or composite prods (often salvaged from recurve bows and constructed for conscripts to use en mass instead of drilling archery skills into them). Thus, due to the longer power stroke via the trigger being placed further back and assuming all other factors are equal, the bolts fired by the Chinese bows (usually with draw weights of 380 lbs) were launched with comparable performance to an average European windlass crossbow (with a draw weight of 1,500 lbs). However, the Chinese crossbows themselves were rather large, cumbersome, and had to be reloaded with just stirrup rings, belt hooks, and/or gloves.

• Chu-Ko-Nu: literally meaning “Zhuge’s Crossbow," classical legend associated it a Chinese noble named Zhuge Liang (2nd Century AD). Alternatively known as the Lian Nu (repeating crossbow), it's also known as the Chinese repeating crossbow and is one of the more common types of crossbow seen in fiction. In reality, it was invented during the Warring States Period (4th Century BC) in the State of Chu. The term "repeating crossbow" brings to mind some bastard combination of Assault rifle and crossbow, which it kinda is and is not. Without doubt, this thing could fire quickly; trained soldiers could loose ten bolts in fifteen seconds before having to reload. Mechanically, it consisted of a stock that the user secured on their hip with the bowstring sliding through a slit on each side of the sliding magazine/bolt rest. By pushing and then pulling the lever that secures the magazine to the stock, the user catches bowstring on a notch at the back end of the slits while loading the bolt by gravity onto the bolt rest. Once the lever is fully compressed down, a sliding lug nut at the base of the magazine pushes the string up off the notches and propels the bolt out. However, because of the mechanism's design, the pumping action that pulled the string back also fired the bolt at the same time while the magazine is built on top of the bow. Due to that, you could not pull the string back and then aim. Chu-ko-nu's were limited to hip fire; giving you almost ork levels of accuracy in exchange for an appreciable volume of fire. In layman's terms, it's the same as being restricted to hip-firing a pump action shotgun with the trigger permanently welded in the fire position. Additionally because you were pulling the string back one handed, the bolts had a lot less penetration power than those of a regular crossbow. However, the bolts (which fell down onto the stock from a hopper mounted on top) were often poisoned to make up for that (as seen with the Drow, who make use of the weapon extensively). While no matter how strong the poison on your bolt is, you're not gonna kill a man instantly with a scratch. However, on the battlefield causing enough pain to make a person go into shock is as good as killing them outright, and poison delivers the last one in spades. The downside was you had next to no luck piercing good quality armor or thick leather that an enemy is wearing while you're using it.

• Balestra Veloce/Löffelholz Armbrust lever-action crossbows: First mentioned in Leonardo Da Vinci's Codex Atlanticus (1478 to 1519) and Martin Löffelholz's Codex Löffelholz (1505), both versions of the said design used a stock consisting of of two wood and metal pieces on top of each other and hinged at the head of the crossbow. By unlocking a latch on the stock, the user can then swing forward the bottom half of the stock to extend a sliding latch to catch the drawstring. Once the drawstring is caught, the stock is then closed; locking the stock back together and bringing the latch (which is held firm by a spring-loaded sear) back into contact with the trigger on the lower half of the stock. User then loaded the bolt and pulled the trigger to compress the sear; letting the rolling nut release the crossbow string. Whether the German or Italian version came first is unclear; though the rapid fire crossbow pages in the Codex Atlanticus are dated back to 1485. Either codex's blueprints can be found online via an online archive created by "The Visual Agency" media company or a pdf scan hosted by Krakow's Jagiellonian Library respectively. While firing and reloading more rapidly than the mainstream "goats foot lever" crossbows, it was not widely used due to possibly three reasons.
  • First, the amount of expert craftsmanship to make it and the extensive training to use it was cost prohibitive for a relatively complicated and delicately structured weapon. This meant that it was likely more of a special luxury weapon that only wealthy people could afford rather than a mass produced weapon for conscripts (the same reason why breech loading rifles existed since the 16th Century for hunting nobility but didn't replace muzzle-loading smoothbore muskets in mass use for militaries until the 1840's).
  • Second, while quicker than spanning a crossbow with a goat's foot or gaffe lever, the draw weight is reduced to a mere average of 220 lbs. Being half of the maximum draw weight of gaffe and goat's foot lever crossbows, this meant weaker penetration and shorter ranges. This was likely to make the lever-action crossbow more easily rearmed without being too strong to either break the trigger lock or cock with your hands.
  • Third, the introduction of gunpowder weapons alongside the volley fire from massed Pike and Shot square formations occurred during the Renaissance. Since these crossbows were developed right when gunpowder took over, this meant these lever-action crossbows already went obsolete the same way that heavy plate-armored cavalry and longbow archers did. Hence, this is why these crossbow types (as well as other related specimens preserved at Vienna' Kunsthistorisches and New York's Metropolitan museums) were usually hunting or city militia pieces rather than military arsenal pieces.

• Latch/Latchet lever-action Crossbow: A light lever action crossbow popular with Scottish border raiders called Reivers in the 1600's to 1700's, it worked via swinging an internal metal lever forward from the top to push a sliding latch forward to secure the drawstring after unlocking the catch. The user then pushed the lever back into the body to arm the bow before loading and shooting. Popular to the Scottish in the region for home defense and raiding as they were small, easy to use, easy to make, very quiet compared to the more finicky wheel-lock pistol, and took only 10 seconds to rearm and load. Their downside was their short range and being restricted to hip firing due to the trigger being a button on the top (a trade off to enable horsemen to fire one-handed from the saddle though you could tuck it into your armpit and adjust to aiming over your thumb).

• Bed Crossbow: A Chinese peculiarity, where multiple crossbows mounted on a static frame were combined to create an increased draw strength. A precursor to the compound crossbow.

• Bullet Crossbows: Also referred to as pelletbows, stonebows, and ballesters, these were essentially the same as regular crossbows or similar to a slingshot in crossbow form, except they fired stone or lead shot instead of bolts. Usually used for recreational shooting and small game hunting.

• Crossbow pistol: Small crossbows designed to be fired from one hand, with modernized versions commonly featuring a more modern pistol grip and trigger. While these did exist in the past, they were nowhere near as lethal as battlefield crossbows as the draw weights were far smaller.

• Arbalast: As European armor improved with the development of steel plate crossbows with wooden bow sections were just not cutting the mustard anymore, as such they began making that part out of steel. This meant that the bow could store more energy and launch a projectile farther and faster, significantly improving armor penetration but it also increased the amount of energy required to draw it, often requiring various leavers and cranking mechanisms to reset it.

• Slurbow: A crossbow with a cover over its barrel and a small gap used to draw its string back. Arguably influenced by the pistol, the slurbow was mostly used for firing unfeathered quarrels or darts.

• Sauterelle: The last apparition of a crossbow-like weapon in a modern battlefield for frontline work. In WWI, soldiers had a problem: all the artillery that existed was big and unable to drop explosives accurately into a trench, especially at close range. And on the other hand, thrown hand grenades had the precision but too limited range. As an interim solution the French invented the Sauterelle (grasshopper in French): basically a big crossbow built to lob grenades at around 150 yards distance. Worked decently enough but later in the war they were replaced by small, two-man team infantry mortars that were just as easy to move around and use but had three or four time the range and a better rate of fire.

• Compound Crossbow: the modern version of the crossbow, which is basically a modern compound bow on a rifle stock. Many of these also come equipped with telescopic sights modified with cross-hairs that compensate for the effects of gravity, wind, elevation, and other factors that might affect a bolt's accuracy. They are primarily used for hunting, sport and (unusually) home defense in Britain since everything else has been banned. Also finds military (specifically special forces, not frontline grunts), espionage and law enforcement utility by being used to fire ziplines or grappling hooks, explosive, incendiary, poisoned or gas releasing projectiles, or simply well made darts for a silent kill. Most use conventional spanning mechanisms but some more recent exotic ones combine various technological concepts from past and present (such as the ones build by hobbyists like Lacas Crossbows or cottage industries like GoGun's Cobra Adder; with those being a bizarre chimera between the Chu-Ko-Nu's hopper magazine (the latter's being detachable), the Balestra Veloce's lever action system, along with modern optics, grips, and compound, composite bow-pieces).

Medieval Weaponry
Melee Weapons:	Battleaxe - Dagger - Lance - Mace - Club Pole-arm - Spear - Sword - Warhammer
Ranged Weapons:	Blowgun - Bows and Arrows - Cannon Crossbow - Firearm - Rocket - Shuriken - Sling - Incendiary Weapons - Artillery
Armor:	Armor - Fantasy Armor - Helmet - Pauldron - Shield