Pot-de-fer
Encyclopedia
Cannon
A cannon is any piece of artillery that uses gunpowder or other usually explosive-based propellents to launch a projectile. Cannon vary in caliber, range, mobility, rate of fire, angle of fire, and firepower; different forms of cannon combine and balance these attributes in varying degrees,...
made of iron
Iron
Iron is a chemical element with the symbol Fe and atomic number 26. It is a metal in the first transition series. It is the most common element forming the planet Earth as a whole, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust...
. It is known as the first metal cannon, and was used by the French
France in the Middle Ages
France in the Middle Ages covers an area roughly corresponding to modern day France, from the death of Louis the Pious in 840 to the middle of the 15th century...
in the Hundred Years' War
Hundred Years' War
The Hundred Years' War was a series of separate wars waged from 1337 to 1453 by the House of Valois and the House of Plantagenet, also known as the House of Anjou, for the French throne, which had become vacant upon the extinction of the senior Capetian line of French kings...
. The name means "iron pot" in French
French language
French is a Romance language spoken as a first language in France, the Romandy region in Switzerland, Wallonia and Brussels in Belgium, Monaco, the regions of Quebec and Acadia in Canada, and by various communities elsewhere. Second-language speakers of French are distributed throughout many parts...
. In Italy, pots-de-fer were known as vasi or vasii, meaning "pot" or "vase
Vase
The vase is an open container, often used to hold cut flowers. It can be made from a number of materials including ceramics and glass. The vase is often decorated and thus used to extend the beauty of its contents....
".
Description
Though occasionally made with castCasting
In metalworking, casting involves pouring liquid metal into a mold, which contains a hollow cavity of the desired shape, and then allowing it to cool and solidify. The solidified part is also known as a casting, which is ejected or broken out of the mold to complete the process...
bronze
Bronze
Bronze is a metal alloy consisting primarily of copper, usually with tin as the main additive. It is hard and brittle, and it was particularly significant in antiquity, so much so that the Bronze Age was named after the metal...
, the pot-de-fer was essentially an iron bottle
Bottle
A bottle is a rigid container with a neck that is narrower than the body and a "mouth". By contrast, a jar has a relatively large mouth or opening. Bottles are often made of glass, clay, plastic, aluminum or other impervious materials, and typically used to store liquids such as water, milk, soft...
with a narrow neck. It was loaded with powder
Gunpowder
Gunpowder, also known since in the late 19th century as black powder, was the first chemical explosive and the only one known until the mid 1800s. It is a mixture of sulfur, charcoal, and potassium nitrate - with the sulfur and charcoal acting as fuels, while the saltpeter works as an oxidizer...
and an iron arrow-like bolt
Quarrel
A quarrel or bolt is the term for the ammunition used in a crossbow. The name "quarrel" is derived from the French carré, "square", referring to the fact that they typically have square heads. Although their length varies, they are typically shorter than traditional arrows.Bolts and arrows have...
, feathered
Fletching
Fletching is the aerodynamic stabilization of arrows or darts with materials such as feathers, each piece of which is referred to as a fletch. The word is related to the French word flèche, meaning "arrow," via Old French; the ultimate root is Frankish fliukka...
with iron. It is believed that the middle of the bolt was likely wrapped in leather
Leather
Leather is a durable and flexible material created via the tanning of putrescible animal rawhide and skin, primarily cattlehide. It can be produced through different manufacturing processes, ranging from cottage industry to heavy industry.-Forms:...
for a snug fit, necessary to enhance the thrust
Thrust
Thrust is a reaction force described quantitatively by Newton's second and third laws. When a system expels or accelerates mass in one direction the accelerated mass will cause a force of equal magnitude but opposite direction on that system....
from the gaseous pressure
Pressure
Pressure is the force per unit area applied in a direction perpendicular to the surface of an object. Gauge pressure is the pressure relative to the local atmospheric or ambient pressure.- Definition :...
within the cannon. However, this feature is not shown in manuscript illumination
Illuminated manuscript
An illuminated manuscript is a manuscript in which the text is supplemented by the addition of decoration, such as decorated initials, borders and miniature illustrations...
s. The cannon was set off through a small-diameter touchhole, where a red-hot wire could be thrust to set off an explosion
Explosion
An explosion is a rapid increase in volume and release of energy in an extreme manner, usually with the generation of high temperatures and the release of gases. An explosion creates a shock wave. If the shock wave is a supersonic detonation, then the source of the blast is called a "high explosive"...
and fire the cannon.
Historical uses and mentions
The pot-de-fer was first depicted in a manuscriptManuscript
A manuscript or handwrite is written information that has been manually created by someone or some people, such as a hand-written letter, as opposed to being printed or reproduced some other way...
, De officiis regum of 1326, by Walter de Millimete, an illuminated manuscript of 1327 that was presented to Edward III upon his accession to the English throne. The manuscript shows a large vase lying on a table, with an armored man behind it holding a rudimentary linstock
Linstock
A linstock is a staff with a fork at one end to hold a lighted slow match. The name was adapted from the Dutch lontstok, "match stick"...
near the bottom (in this case the linstock would have held a red-hot wire, heated in a brazier, rather than a slow match). A bolt, called a garrot, protrudes from the muzzle
Muzzle (firearm)
The muzzle of a firearm is the end of the barrel from which the projectile will exit.Precise machining of the muzzle is crucial to accuracy, because it is the last point of contact between the barrel and the projectile...
. Although illustrated in the treatise, no explanation or description was given.
The pot-de-fer was used by the French in the Hundred Years' War
Hundred Years' War
The Hundred Years' War was a series of separate wars waged from 1337 to 1453 by the House of Valois and the House of Plantagenet, also known as the House of Anjou, for the French throne, which had become vacant upon the extinction of the senior Capetian line of French kings...
in a raid on Southampton
Southampton
Southampton is the largest city in the county of Hampshire on the south coast of England, and is situated south-west of London and north-west of Portsmouth. Southampton is a major port and the closest city to the New Forest...
and in battles in Périgord
Périgord
The Périgord is a former province of France, which corresponds roughly to the current Dordogne département, now forming the northern part of the Aquitaine région. It is divided into four regions, the Périgord Noir , the Périgord Blanc , the Périgord Vert and the Périgord Pourpre...
, Cambrai
Cambrai
Cambrai is a commune in the Nord department in northern France. It is a sub-prefecture of the department.Cambrai is the seat of an archdiocese whose jurisdiction was immense during the Middle Ages. The territory of the Bishopric of Cambrai, roughly coinciding with the shire of Brabant, included...
, and Quesnoy
Quesnoy
Quesnoy may refer to:*Le Quesnoy, Nord, France*Louvignies-Quesnoy, Nord, France*Quesnoy-sur-Deûle, Nord, France*Le Quesnoy-en-Artois, Pas-de-Calais, France...
. They may also have been used against the Scottish
Kingdom of Scotland
The Kingdom of Scotland was a Sovereign state in North-West Europe that existed from 843 until 1707. It occupied the northern third of the island of Great Britain and shared a land border to the south with the Kingdom of England...
by the English.
An early reference to the name in French is as pot de fer a traire garros (an iron jug for throwing arrows). Such a 'pot de fer' had a bottle shape, which may have suggested its name.
Scholarly interest and research
Royal Armouries
The Royal Armouries is the United Kingdom's National Museum of Arms and Armour. It is the United Kingdom's oldest museum, and one of the oldest museums in the world. It is also one of the largest collections of arms and armour in the world, comprising the UK's National Collection of Arms and...
reconstructed
Replica
A replica is a copy closely resembling the original concerning its shape and appearance. An inverted replica complements the original by filling its gaps. It can be a copy used for historical purposes, such as being placed in a museum. Sometimes the original never existed. For example, Difference...
and trialled the weapon in 1999. The walls of the chamber were very thick to prevent explosion, leaving a cylindrical bore
Caliber
In guns including firearms, caliber or calibre is the approximate internal diameter of the barrel in relation to the diameter of the projectile used in it....
which was loaded by a wooden arrow with bronze flights (also reconstructed based on archeological findings), of 135 cm length. Estimating the size of the cannon from the illustrated man standing beside it, the reconstructed cannon was 90 cm long, and 40 cm at its widest point; cast in bronze the reconstruction weighed 410 kg
Kilogram
The kilogram or kilogramme , also known as the kilo, is the base unit of mass in the International System of Units and is defined as being equal to the mass of the International Prototype Kilogram , which is almost exactly equal to the mass of one liter of water...
. The subsequent trials showed that the gun was not powerful, firing the arrow only 180 m at most; a larger charge of powder resulted only in the destruction of the arrow.
See also
- Battle of CrécyBattle of CrécyThe Battle of Crécy took place on 26 August 1346 near Crécy in northern France, and was one of the most important battles of the Hundred Years' War...
- BombardBombard (weapon)A bombard is a large-caliber, muzzle-loading medieval cannon or mortar, used chiefly in sieges for throwing heavy stone balls. The name bombarde was first noted and sketched in a French historical text around 1380. The modern term bombardment derives from this.Bombards were usually used during...
- GunpowderGunpowderGunpowder, also known since in the late 19th century as black powder, was the first chemical explosive and the only one known until the mid 1800s. It is a mixture of sulfur, charcoal, and potassium nitrate - with the sulfur and charcoal acting as fuels, while the saltpeter works as an oxidizer...