The Mediaeval Crossbow

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The Crossbow. Instantly recognisable to small boys everywhere, it has a layman's reputation for power and accuracy.
Yet in supposedly knowledgeable circles, especially in the UK, it is often referred to disparagingly and attitudes
tend towards condemning it as a waste of space and no match for the mighty Longbow.

This entry attempts to present some facts, rather than opinion, about the crossbow. The main period of focus here is
from the late 11th Century through to the end of the 15th Century, when gunpowder became more prevalent.


  • Prod - The bow may be made as a single piece, or constructed from two halves. The term applies both to the individual halves and to the complete single piece. Therefore, confusingly, the prod can either be the whole bow or one of the arms which make up the bow.
  • Stock - The main body of the crossbow to which the prod is attached. Houses the tiller and nut which comprises the release mechanism.
  • Tiller - The 'trigger' which is used to release the string and thus shoot the bolt.
  • Nut - The rotating catch which, in conjunction with the tiller, holds the string of the crossbow in the spanned position. When the tiller is used,
    the nut is freed and the string releases to shoot the bolt.
  • Spanning - The act of moving the string onto the nut of the crossbow thus preparing it to shoot. There was no safety catch on 15th Century or earlier bows, so in this state the crossbow was potentially lethal to anyone it was pointed at, intent notwithstanding.
  • Quarrel - a square-headed bolt or arrow especially for a crossbow.
  • Bolt - Common, interchangeable, term for quarrel.
  • Pavise - A large curved shield specifically designed for the crossbowman to hide behind during battle. They were self supporting and were stood on the ground, not held by the crossbowman. It protected him whilst he spanned the crossbow.
  • Draw Weight - The weight required to draw the string from the rest position to the shooting position (the nut on the crossbow or the archers shoulder on the longbow).
  • Draw Length - The distance the centre of the string moves from the rest position to the spanned position.1
  • Loose/Loosing - Term applied to the act of shooting the bolt. To loose a bolt or arrow is to shoot it. Archers were commanded to 'Ready, Aim, Loose' when required to shoot on command.


Crossbows, and long/short bows, were not fired, they were shot. This is because the term firing came in with the popular use of handguns
and then was retrospectively applied to the act of shooting anything. During the period of use, you would shoot a crossbow.
If you told someone of the period to fire a crossbow they would look askance at you since to 'fire' something meant to set it on fire and burn it; eg using fire arrows to fire a building.
When reading around the subject, any document referring to the 'firing' of a bow or crossbow should be immediately viewed with suspicion as it is likely it has been either dumbed down or written by someone with little knowledge of the subject.

The Crossbow Prior to the 11th Century

The crossbow is a very old weapon, stretching back some 5000 years in China. Perhaps the most famous Chinese crossbow was the repeating bow.
This was a relatively low-powered bow, due to the single-handed operation of the spanning lever, and was used by local law enforcement. Due to its low power, and therefore shorter range, the bolts it shot were often poison-coated to ensure that they had the desired effect on the target.
One of the earliest, and greatest, exponents of its use were the Romans. They developed it from the simple handbow right up to siege weapons.
There is also at least one account, and circumstantial archaeological evidence for, a Roman repeating siege crossbow. This was stationary and mounted on some form of stand and used to accurately bombard a target with multiple ballista bolts.
Interestingly, when the Romans left Britain, so did the crossbow. It was not reintroduced until the Norman Conquest.
Although there are no crossbows depicted on the Bayeux tapestry, records of the time refer to payments made for crossbowmen.
However, its use continued in Europe.

The 11th to 15th Centuries

The crossbow has had a long and chequered history, particularly in England where it has lost out to the longbow.
There are several reasons for this, but the English wins using the longbow at both Cr├ęcy and Agincourt,
and the political gains made from this, are a major cause.

The devastating effect of the crossbow and the wounds it could inflict are reflected by early weapons bans. In April 1139 the Second Lateran Council, under Pope Innocent II, banned the use of the crossbow against Christians. 2. The Latin text is as follows:

Artem autem illam mortiferam et Deo odibilem ballistoriorum et sagittariorum, adversus christianos et catholicos de cetero sub anathemate prohibemus
Translation:We prohibit under anathema that murderous art of crossbowmen and archers, which is hated by God, to be employed against Christians and Catholics from now on

This ban was reissued many times over the following years and centuries, although it continued to be largely ignored by many.
Similarly, the Magna Carta banned the use of the crossbow as a battlefield weapon in England. This was, again, ignored by all concerned.
Article (51) "Et statim post pacis reformacionem amovebimus de regno omnes alienigenas milites, balistarios, servientes, stipendiarios, qui venerint cum equis et armis ad nocumentum regni."
Translation: "As soon as peace is restored, we will banish from the kingdom all foreign born knights, crossbow men, sergeants, and mercenary soldiers who have come with horses and arms to the kingdom's hurt."

Crossbow Development

Early bows had plain wooden prods, often utilising similar woods to the bow. These progressed to laminated woods, and wood and sinew.
The bows were spanned by sitting down and placing the bow over the feet, then drawing the string back towards you and hooking it over the nut.
Due to this the crossbows were referred to as one-foot or two-foot bows, depending on whether you would use one foot or both feet to do this. It does not refer to the dimension of the crossbow in any way.

Later bows, from the 14th/15th century started to use metal prods. These gave much greater reliability and draw weights. There were also other technologies developed to improve efficiency.
For example, the stock of the crossbow was often angled very slightly upwards (as a modern rifle is) so that when aimed on a flat trajectory at a man's head at 70 yards the bolt would hit the man no lower than his chin.
The stocks, and the bolts, were often shaped to remove unwanted wood. This is because the greatest friction is between the bolt and the crossbow stock. If you shape the bolt so that only two points of it rest on the bow (like an hour glass on its side) there is less friction. Alternatively the bow stock would be tapered down towards the end. This meant that as the bolt was only in contact with the stock for half its length when shot.

One misconception about the crossbow is that it was in direct competition to the long bow.
They are very different weapons, but often compared as they have a similar mechanical design and are both ranged weapons.
It would be like comparing a sniper rifle with an AK47. Both very good at their job, but when you absolutely, positively have to kill every Frenchman on the field, 5,000 longbow archers is what you need!
However, if you are protecting a castle or a ship, from behind defences, then a crossbow is by far the better choice. This is due to its smaller size, greater accuracy and ease of use. Indeed, the crossbow was still used on ships after the bow had been replaced by the gun.


The longbow, whilst very effective in what it does, is not the greatest weapon of its age.
Otherwise, everyone else would have used them!
For example, the French retained a small force of longbow archers. However, they never achieved the success or recognition of the English longbow archers. This was mainly due to the perception that the time, effort and cost taken to train a competent longbow archer was just not worth it. Many European countries relied instead on mercenary groups, such as the renowned Genoese crossbowmen.


The crossbows used in battle have a longer range than the bows. They also have a longer effective range.
This is due mainly to the poundage, a typical battlefield crossbow having anything up to 1200lb draw weight whereas the heaviest longbow would be in the 150lb area. The projectile also has an effect. The crossbow bolt is smaller and offers less resistance.
When compared on equal draw weight, the crossbow and longbow are roughly equal on range, the crossbow slightly losing out to the longbow in this researcher's experience.

On even ground, the longest verified longbow shot was somewhere in the low 300 yards (perhaps as much as 350 but this is unconfirmed). The crossbow could be effective to 100 yards more than that. They've been used to shoot across the Menai Straits 3 before now. The heaviest long bow was up to 150lb, the crossbow would be 500lb +. So the comparison is not of like with like. If like for like poundage is compared, and this researcher has done some experimentation in this area, a 100lb longbow seems to have further range than the crossbow since the arrows are developed to 'fly' and are lighter. The crossbow bolt is not. It is short, sharp, and to the point. A 2.5 oz. head is common for a warhead bolt on a light (100lb-150lb) bow.


The crossbow is much slower than the longbow. During the peak of the longbows usage, an archer had to be able to loose twelve arrows a minute and was expected to loose more. A competent archer could manage seventeen or so and a very good archer could manage up to twenty four per minute.
Comparatively the crossbow managed much less, although there is no single figure due to the different methods of spanning the bow.

  • Windlass (400lb or greater) One per minute (or less!)
  • Cranequin (250lb +) Two or maybe three if lucky!
  • Goat's foot leaver (250lb -350lb) Three per minute
  • Belt Hook (125lb +) Three to four
  • Hand spanned (equal to or less than 125lb) Seven, or possibly eight (seven is the best this researcher has managed!)


Both the bow and the crossbow suffer from their strings being sensitive to damp and rain.
Once damp, the string expands and the poundage drops.
Longbows have another reliability issue peculiar to themselves.
When a longbow is fully drawn, it is in fact three quarters broken! This is another reason they are not as accurate since
the archer would want to minimise the amount of time at full draw.
Metal prod crossbows obviously do not have this problem.

Ease of use

To properly be able to use a longbow you had to be trained, every week, from age 5 onwards. An archer would not be considered properly proficient till they were in their late teens.
With the crossbow, anyone can pick one up and get the bolt somewhere near the target. To be good, lots of practice is still required, but not as much as with the longbow.


A long bow can be very accurate over shorter distances, but since the arrow is longer and lighter it is more susceptible to the wind and other factors. Hence it is less accurate the further it goes.

If you were defending a castle, a crossbows smaller size made it easier to manoeuvre in the enclosed archers' platforms and through the slits. Especially for vertical movement. In fact there was one Spanish arbalister who used the crossbow long after the invention of muskets as he was quicker and more accurate than they could possibly be. He was an exception though.


The longbow depends, in the UK anyway, on a very good press following Crecy and Agincourt. But reading up on those will show
that it wasn't quite the decisive weapon it is made out to be. Crecy would have been a lot different if the Genoese hadn't
got their bowstrings wet and been unable to use them. They were then ridden down by the French knights on their own side.

Apparently they were very close to using the Longbow in the American war of independence. This was due to its ease of manufacture and capability for killing or maiming large numbers of people.

The range of the longbow was increased by using 'flight' arrows. These were much lighter and not really designed to do much damage. The intent was to frighten and rout the opposing side by having huge numbers of arrows falling out the air on them and clattering on their armour. Anyone unprotected could still easily be injured.


If you look at paintings of the time, you will see the crossbow more often levelled at the opponent to aim. Whereas the longbow
(or shortbow) is aimed at an angle. This is another area where the range myth comes in, since an angled release will carry the projectile further. It also demonstrates clearly the difference in usage. A longbow archer would try to bring the arrow down on top of the enemy, in large numbers. The crossbowman would aim straight at the enemy in front of him and aim for a single, fatal shot.

Longbows do manage to stay in the game because, even though the draw weight is so much lower, the arrows and the bolts both leave their respective weapons at about the same velocity. This is because the ends of the longbow are further apart (6ft or so) and thus travel further. Because they travel further they have longer to build up the speed of the arrow.
The crossbow on the other hand typically has a span of 2ft to 3ft and thus the ends of the bow do not move as far, thereby not having time to speed the bolt up as much. Obviously a 500lb crossbow with a 6ft bow would completely devastate a longbow of 6ft. These are called siege weapons and are another subject!

Contemporary terminology for Crossbowmen

Arbalestier: old French
Arcubalistarius, Balistarios: mediaeval Latin
Arbaletrier: modern French
Arbalister, Arbalester: mediaeval Spanish.

These terms are considered by many to have given rise to several surnames in European countries such as:

The English Alabastar, Alabester, Alabasters, Arblasts, Balsters, Balistarius, Albalestarius, Arblaster, Balister

The French Larbalestier, L'arbalestier

The Spanish Ballesteros4

The names are thought to be derived from official titles for those who held a position as a retained crossbowman or as a crossbow maker.


  • The Book Of The Crossbow - Ralph Payne-Gallwey ISBN 0486287203
  • The Devills Enginne - Gary G. Ball ISBN 1858041597
  • This researchers own experience!
1A well documented 15th Century assassins bow from Italy had a draw weight of 90lb and a draw length of 2 inches. It shot 6 inch steel bolts and was an effective way of out voting your political opponents.2Although some historians dispute this motivation assigned to the ban.3MENAI STRAITS. a 14 mile channel of the Irish Sea, separating Anglesey from Caernarvonshire, North Wales.4Some may recognise this from the name of Seve Ballesteros, the famous golfer.

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