The ''pot-de-fer'' was a primitive

cannon A cannon is a large- caliber gun classified as a type of artillery, which usually launches a projectile using explosive chemical propellant. Gunpowder ("black powder") was the primary propellant before the invention of smokeless powder ...

made of

iron Iron () is a chemical element with symbol Fe (from la, ferrum) and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, right in ...

. It was used by the French in the

Hundred Years' War The Hundred Years' War (; 1337–1453) was a series of armed conflicts between the kingdoms of England and France during the Late Middle Ages. It originated from disputed claims to the French throne between the English House of Plantagen ...

. The name means "iron pot" in

French French (french: français(e), link=no) may refer to: * Something of, from, or related to France ** French language, which originated in France, and its various dialects and accents ** French people, a nation and ethnic group identified with Franc ...

. In Italy, ''pots-de-fer'' were known as ''vasi'' or ''vasii'', meaning "pot" or "

vase A vase ( or ) is an open container. It can be made from a number of materials, such as ceramics, glass, non-rusting metals, such as aluminium, brass, bronze, or stainless steel. Even wood has been used to make vases, either by using tree species ...

Description

Though occasionally made with

cast Cast may refer to: Music * Cast (band), an English alternative rock band * Cast (Mexican band), a progressive Mexican rock band * The Cast, a Scottish musical duo: Mairi Campbell and Dave Francis * ''Cast'', a 2012 album by Trespassers William ...

bronze Bronze is an alloy consisting primarily of copper, commonly with about 12–12.5% tin and often with the addition of other metals (including aluminium, manganese, nickel, or zinc) and sometimes non-metals, such as phosphorus, or metalloids suc ...

, the ''pot-de-fer'' was essentially an iron

bottle A bottle is a narrow-necked container made of an impermeable material (such as glass, plastic or aluminium) in various shapes and sizes that stores and transports liquids. Its mouth, at the bottling line, can be sealed with an internal s ...

with a narrow neck. It was loaded with

powder A powder is a dry, bulk solid composed of many very fine particles that may flow freely when shaken or tilted. Powders are a special sub-class of granular materials, although the terms ''powder'' and '' granular'' are sometimes used to distin ...

and an iron arrow-like bolt, feathered with iron. It is believed that the middle of the bolt was likely wrapped in

leather Leather is a strong, flexible and durable material obtained from the tanning, or chemical treatment, of animal skins and hides to prevent decay. The most common leathers come from cattle, sheep, goats, equine animals, buffalo, pigs and hog ...

for a snug fit, necessary to enhance the

thrust Thrust is a reaction force described quantitatively by Newton's third law. When a system expels or accelerates mass in one direction, the accelerated mass will cause a force of equal magnitude but opposite direction to be applied to that ...

from the gaseous

pressure Pressure (symbol: ''p'' or ''P'') is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure (also spelled ''gage'' pressure)The preferred spelling varies by country a ...

within the cannon. However, this feature is not shown in

manuscript illumination An illuminated manuscript is a formally prepared document where the text is often supplemented with flourishes such as borders and miniature illustrations. Often used in the Roman Catholic Church for prayers, liturgical services and psalms, th ...

s. The cannon was set off through a small-diameter touchhole, where a red-hot wire could be thrust to set off an

explosion An explosion is a rapid expansion in volume associated with an extreme outward release of energy, usually with the generation of high temperatures and release of high-pressure gases. Supersonic explosions created by high explosives are known ...

and fire the cannon.Manucy, Albert, ''Artillery through the Ages: A Short Illustrated History of Cannon'', p. 3 (Washington, United States Government Printing Office, 1949; The Minerva Group, new edition 2001)

Historical uses and mentions

The ''pot-de-fer'' was first depicted in a

manuscript A manuscript (abbreviated MS for singular and MSS for plural) was, traditionally, any document written by hand – or, once practical typewriters became available, typewritten – as opposed to mechanically printed or reproduced i ...

, ''De officiis regum'' of 1326, by

Walter de Millimete Walter de Milemete was an English scholar who in his early twenties was commissioned by Queen Isabella of France to write a treatise on kingship for her son, the young prince Edward, later king Edward III of England called ''De nobilitatibus, ...

, an illuminated manuscript of 1327 that was presented to

Edward III Edward III (13 November 1312 – 21 June 1377), also known as Edward of Windsor before his accession, was King of England and Lord of Ireland from January 1327 until his death in 1377. He is noted for his military success and for restoring r ...

upon his accession to the

English throne The Throne of England is the throne of the Monarch of England. "Throne of England" also refers metonymically to the office of monarch, and monarchy itself.Gordon, Delahay. (1760) ''A General History of the Lives, Trials, and Executions of All th ...

. The manuscript shows a large vase lying on a table, with an

armor Armour (British English) or armor (American English; see spelling differences) is a covering used to protect an object, individual, or vehicle from physical injury or damage, especially direct contact weapons or projectiles during combat, or f ...

ed man behind it holding a rudimentary

linstock A linstock (also called a lintstock) 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". Linstocks were used for discharging cannons in the early days of artillery; th ...

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. Although illustrated in the treatise, no explanation or description was given.Nossov, Konstantin; ''Ancient and Medieval Siege Weapons'', UK: Spellmount Ltd, 2006, pp 205-208, The ''pot-de-fer'' was used by the French in the

in a raid on

Southampton Southampton () is a port city in the ceremonial county of Hampshire in southern England. It is located approximately south-west of London and west of Portsmouth. The city forms part of the South Hampshire built-up area, which also covers Po ...

and in battles in

Périgord Périgord ( , ; ; oc, Peiregòrd / ) is a natural region and former province of France, which corresponds roughly to the current Dordogne department, now forming the northern part of the administrative region of Nouvelle-Aquitaine. It is div ...

Cambrai Cambrai (, ; pcd, Kimbré; nl, Kamerijk), formerly Cambray and historically in English Camerick or Camericke, is a city in the Nord department and in the Hauts-de-France region of France on the Scheldt river, which is known locally as the ...

, and Quesnoy. They may also have been used against the Scottish 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).Dana, Charles E., ''Notes on Cannon - Fourteenth and Fifteenth Centuries'' in ''Proceedings of the American Philosophical Society'', Vol. 50, No. 199 (May - Aug., 1911), pp. 147-167 Such a 'pot de fer' had a bottle shape, which may have suggested its name.

Scholarly interest and research

The unusual vase-like shape of the cannon, coupled with the depicted arrow projectile, caused many modern historians to doubt the efficiency — or even existence — of the weapon. In order to establish these points, researchers at the

Royal Armouries The Royal Armouries is the United Kingdom's national collection of arms and armour. Originally an important part of England's military organization, it became the United Kingdom's oldest museum, originally housed in the Tower of London from ...

reconstructed and trialled the weapon in 1999. The walls of the chamber were very thick to prevent explosion, leaving a cylindrical bore 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. 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.

References

{{Early firearms Cannon Medieval artillery Artillery of France

Description

Historical uses and mentions

Scholarly interest and research

See also

References