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The word “loophole” originated with small slits in medieval walls that let archers fire arrows at attackers of the castle

Goran Blazeski

Castles are magnificent structures that were primarily built for protection during the Middle Ages. At first, people used to build castles of earth and wood, but as time passed, these structures became more and more sophisticated, with most of them being built in stone.

Castles originated in the 9th and 10th centuries and served both offensive and defensive purposes. Kings would often use them as a place to mount attacks from and extend their kingdoms, but they also used castles in order to protect the people from invaders.

The wooden palisades surmounting mottes were often later replaced with stone, as in this example at Château de Gisors in France. Author: Nitot – CC BY-SA 3.0
The wooden palisades surmounting mottes were often later replaced with stone, as in this example at Château de Gisors in France. Author: Nitot – CC BY-SA 3.0

Since castle defenders were often outnumbered, the architects had to introduce various features to make the castle as impenetrable as possible.

Around the outside of a castle, a wall was typically built, and then around this wall, another wall, and in some cases, a third wall. If the outer wall was breached, castle defenders were able to retreat to an inner set of walls and the siege began all over again.

Bodiam Castle in East Sussex, England, surrounded by a water-filled moat. Author: Antony McCallum – WyrdLight.com – CC BY-SA 3.0
Bodiam Castle in East Sussex, England, surrounded by a water-filled moat. Author: Antony McCallum – WyrdLight.com – CC BY-SA 3.0

Castles were often circled all the way around by a deep and wide water-filled trench in order to protect it from siege machines such as siege towers and battering rams. Burrowing beneath the castle was impossible if there was a moat around it.

Over the moat of the castle extended a large wooden bridge that could be raised if the castle was attacked. Castle architects also built towers to maximize the view and spot oncoming attackers.

Caerlaverock Castle in Scotland is surrounded by a moat – a ditch filled with water. An aerial view of the 13th century stone building with a triangular plan. Author: Simon Ledingham – CC BY-SA 2.0
Caerlaverock Castle in Scotland is surrounded by a moat – a ditch filled with water. An aerial view of the 13th century stone building with a triangular plan. Author: Simon Ledingham – CC BY-SA 2.0

Since archers were capable of deciding the outcome of the battle, they had the central role in castle defenses. Archers were a part of the armies of almost all ancient civilizations and continued to be an integral part of armies through to medieval times.

A loophole at Corfe Castle. This shows the inside where the archer would have stood. Author: John Bointon from Watford, UK – Flickr – CC BY 2.0
A loophole at Corfe Castle. This shows the inside where the archer would have stood. Author: John Bointon from Watford, UK – Flickr – CC BY 2.0

Toward the end of the 12th century, castle designers reintroduced the use of what is known of as loopholes, or arrowslits, in castle architecture. Yes, you read it correctly, loopholes. But not as an ambiguity in a rule or a law that can be exploited, as we know it as today, but as a feature of medieval castle architecture.

If you had the chance to visit one of the many medieval castles throughout Europe, you probably noticed the narrow slits in the walls of the castles through which an archer could launch arrows. These narrow slits in the walls of the castles were referred to as “loopholes.” Just like the modern-day figurative loopholes, castle loopholes allowed a person to exploit an opening.

Archimedes around 214 B.C. created loopholes during the siege of Syracuse. They fell out of favor until the 12th century, when they were then reintroduced to military architecture.

Loopholes in an old city gate tower.
Loopholes in an old city gate tower.

At first, loopholes were thin vertical openings in the walls of a castle and had a limited field of vision, but they became more advanced with the addition of horizontal openings, which allowed those inside the castle to see the potential attackers before they enter range.

A loophole at White Castle, Wales. Author: Andy Dingley – CC BY-SA 3.0
A loophole at White Castle, Wales. Author: Andy Dingley – CC BY-SA 3.0

By adding horizontal openings, these changes in the loopholes allowed the archers to defend a larger part of the castle, as the angles that one could fire arrows from were greater.

Read another story from us: Berry Pomeroy Castle is considered as one of the most haunted castles in Britain

Although loopholes were originally designed for use with bows, they were adapted to accommodate the crossbow and widely used in the 13th, 14th, and 15th centuries.

Goran Blazeski

Goran Blazeski is one of the authors writing for The Vintage News