An arrowslit (often also referred to as an arrow loop, loophole or loop hole, and sometimes a balistraria) is a narrow vertical aperture in a

fortification A fortification (also called a fort, fortress, fastness, or stronghold) is a military construction designed for the defense of territories in warfare, and is used to establish rule in a region during peacetime. The term is derived from Lati ...

through which an archer can launch

arrow An arrow is a fin-stabilized projectile launched by a bow. A typical arrow usually consists of a long, stiff, straight shaft with a weighty (and usually sharp and pointed) arrowhead attached to the front end, multiple fin-like stabilizers c ...

s or a

crossbowman An arbalist, also spelled arbelist, is one who shoots a crossbow. Background An extensive list of archaic words for medieval crossbowmen is given by Payne-Gallwey. Richardson, in his 1839 dictionary, did not make specific reference to the cross ...

can launch bolts. The interior walls behind an arrow loop are often cut away at an

oblique angle In Euclidean geometry, an angle can refer to a number of concepts relating to the intersection of two straight lines at a point. Formally, an angle is a figure lying in a plane formed by two rays, called the '' sides'' of the angle, sharing ...

so that the archer has a wide

field of view The field of view (FOV) is the angle, angular extent of the observable world that is visual perception, seen at any given moment. In the case of optical instruments or sensors, it is a solid angle through which a detector is sensitive to elec ...

and

field of fire The field of fire or zone of fire (ZF) of a weapon, or group of weapons, is the area around it that can easily and effectively be reached by projectiles from a given position. Field of fire The term originally came from the ''field of fire'' in f ...

. Arrow slits come in a variety of forms. A common one is the

cross A cross is a religious symbol consisting of two Intersection (set theory), intersecting Line (geometry), lines, usually perpendicular to each other. The lines usually run vertically and horizontally. A cross of oblique lines, in the shape of t ...

, accommodating the use of both the

longbow A longbow is a type of tall bow that makes a fairly long draw possible. Longbows for hunting and warfare have been made from many different woods in many cultures; in Europe they date from the Paleolithic era and, since the Bronze Age, were mad ...

and the

crossbow A crossbow is a ranged weapon using an Elasticity (physics), elastic launching device consisting of a Bow and arrow, bow-like assembly called a ''prod'', mounted horizontally on a main frame called a ''tiller'', which is hand-held in a similar f ...

. The narrow vertical aperture permits the archer large degrees of freedom to vary the

elevation The elevation of a geographic location (geography), ''location'' is its height above or below a fixed reference point, most commonly a reference geoid, a mathematical model of the Earth's sea level as an equipotential gravitational equipotenti ...

and direction of their bowshot but makes it difficult for attackers to harm the archer since there is only a small target at which to aim. Balistraria, plural ''balistrariae'' (from balister, crossbowman), can often be found in the curtain walls of medieval

battlements A battlement, in defensive architecture, such as that of city walls or castles, comprises a parapet (a defensive low wall between chest-height and head-height), in which gaps or indentations, which are often rectangular, occur at intervals t ...

beneath the crenellations.

History

The invention of the arrowslit is attributed to

Archimedes Archimedes of Syracuse ( ; ) was an Ancient Greece, Ancient Greek Greek mathematics, mathematician, physicist, engineer, astronomer, and Invention, inventor from the ancient city of Syracuse, Sicily, Syracuse in History of Greek and Hellenis ...

during the siege of Syracuse in 214–212 BC (although archaeological evidence supports their existence in Egyptian Middle Kingdom

forts A fortification (also called a fort, fortress, fastness, or stronghold) is a military construction designed for the defense of territories in warfare, and is used to establish rule in a region during peacetime. The term is derived from ...

around 1860 BC). Slits "of the height of a man and about a palm's width on the outside" allowed defenders to shoot bows and

scorpions Scorpions are predatory arachnids of the Order (biology), order Scorpiones. They have eight legs and are easily recognized by a pair of Chela (organ), grasping pincers and a narrow, segmented tail, often carried in a characteristic forward cur ...

(an ancient siege engine) from within the

city wall A defensive wall is a fortification usually used to protect a city, town or other settlement from potential aggressors. The walls can range from simple palisades or Earthworks (military), earthworks to extensive military fortifications such as ...

s.. Although used in late Greek and Roman defences, arrowslits were not present in early Norman

castle A castle is a type of fortification, fortified structure built during the Middle Ages predominantly by the nobility or royalty and by Military order (monastic society), military orders. Scholars usually consider a ''castle'' to be the private ...

s. They are reintroduced to military architecture only towards the end of the 12th century, with the castles of

Dover Dover ( ) is a town and major ferry port in Kent, southeast England. It faces France across the Strait of Dover, the narrowest part of the English Channel at from Cap Gris Nez in France. It lies southeast of Canterbury and east of Maidstone. ...

and Framlingham in England, and Richard the Lionheart's

Château Gaillard Château Gaillard () is a medieval castle ruin overlooking the River Seine above the commune of Les Andelys, in the French department of Eure, in Normandy. It is located some north-west of Paris and from Rouen. Construction began in 1196 u ...

in France. In these early examples, arrowslits were positioned to protect sections of the castle wall, rather than all sides of the castle. In the 13th century, it became common for arrowslits to be placed all around a castle's defences. Elements of fortification such as arrowslits became associated with high social standing and authority. As such, damaging them could be significant as an aspect of

slighting Slighting is the deliberate damage of high-status buildings to reduce their value as military, administrative, or social structures. This destruction of property is sometimes extended to the contents of buildings and the surrounding landscape. It ...

. The successor of arrowslits after the advent of

gunpowder Gunpowder, also commonly known as black powder to distinguish it from modern smokeless powder, is the earliest known chemical explosive. It consists of a mixture of sulfur, charcoal (which is mostly carbon), and potassium nitrate, potassium ni ...

was the loophole for

firearm A firearm is any type of gun that uses an explosive charge and is designed to be readily carried and operated by an individual. The term is legally defined further in different countries (see legal definitions). The first firearms originate ...

Design

In its simplest form, an arrowslit was a narrow vertical opening; however, the different weapons used by defenders sometimes dictated the form of arrowslits. For example, openings for longbowmen were usually tall and high to allow the user to shoot standing up and make use of the bow, while those for crossbowmen were usually lower down as it was easier for the user to shoot whilst kneeling to support the weight of the weapon. It was common for arrowslits to widen to a triangle at the bottom, called a fishtail, to allow defenders a clearer view of the base of the wall. Immediately behind the slit there was a recess called an

embrasure An embrasure (or crenel or crenelle; sometimes called gunhole in the domain of Age of Gunpowder, gunpowder-era architecture) is the opening in a battlement between two raised solid portions (merlons). Alternatively, an embrasure can be a sp ...

; this allowed a defender to get close to the slit without being too cramped. The width of the slit dictated the field of fire, but the field of vision could be enhanced by the addition of horizontal openings; they allowed defenders to view the target before it entered range. Usually, the horizontal slits were level, which created a cross shape, but less common was to have the slits off-set (called displaced traverse slots) as demonstrated in the remains of White Castle in Wales. This has been characterised as an advance in design as it provided attackers with a smaller target; however, it has also been suggested that it was to allow the defenders of White Castle to keep attackers in their sights for longer because of the steep

moat A moat is a deep, broad ditch dug around a castle, fortification, building, or town, historically to provide it with a preliminary line of defence. Moats can be dry or filled with water. In some places, moats evolved into more extensive water d ...

surrounding the castle. Hartshill Castle cross-loops

When an embrasure linked to more than one arrowslit (in the case of

Dover Castle Dover Castle is a medieval castle in Dover, Kent, England and is Grade I listed. It was founded in the 11th century and has been described as the "Key to England" due to its defensive significance throughout history. Some writers say it is the ...

, defenders from three embrasures can shoot through the same arrowslit) it is called a "multiple arrowslit". Some arrowslits, such as those at

Corfe Castle Corfe Castle is a fortification standing above the Corfe Castle (village), village of the same name on the Isle of Purbeck peninsula in the English county of Dorset. Built by William the Conqueror, the castle dates to the 11th century and ...

, had lockers nearby to store spare arrows and bolts; these were usually located on the right hand side of the slit for ease of access and to allow a rapid rate of fire.

History

Design

See also

References

Bibliography

External links