Castle Defense *Weapons List

Medieval castles became popular across Europe from the 10th century onwards. From this period until the end of the medieval era, castles evolved significantly and so did their overall structures and defenses.

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The most vital military problem faced by a medieval castle was the possibility of facing a siege. If a siege was laid on the castle, it had to be appropriately equipped and defended in order to ward off the attacking force. In doing so a number of weapons were used by the defenders of the castle.

Siege orleans canon


The Catapult was a weapon that was popularly used to attack a castle but it was equally effective in defending a castle. When defending a castle against an attack from the outside, the catapult was typically positioned in an open square or on top of a sizable tower.

Medieval French Castle in Carcassonne

It was then used to fire directly at enemy lines. The catapult was frequently aimed at destroying the siege towers and other siege engines of the attacking force.

It was also used to throw large rocks on enemy formations in order to disrupt enemy lines that were sometimes complemented with a quick sally from castle gates by the castle’s garrison.

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However, a catapult could offer limited damage to the enemy forces because of its limited range and the fact that it was a cumbersome weapon to be used by castle defenders. On the other hand, when used to attack castle walls from the outside, a catapult was highly effective.

Siege Weapons Castles


A more rudimentary type of weapon was simply rocks or stones. In desperate situations especially when a castle didn’t have a large enough garrison but enough household members, people inside the castle would simply pick up huge rocks and stones and start launching them from the castle walls.

Machicolations and Murder Holes

If the attacking force had reached the castle walls, such a hail of rocks and stones from castle walls was a dangerous enough weapon to be taken seriously. Typically, rocks thrown from castle walls proved an effective defence against enemy soldiers trying to scale castle walls.

Various types of boiling liquids could also be poured onto besieging enemy soldiers.

A Medieval Castle Being Defended Under Siege


When defending a medieval castle, the defenders on castle walls made use of their high position by launching missiles into enemy lines. A crossbow was a highly effective weapon in this regard. Different types of crossbows were used throughout different phases of the medieval era.

Medieval Crossbow Weapon

The Crossbow became especially popular with castle defenders because it allowed them to wreak havoc on enemy lines from a distance. A good crossbow, when wielded by an expert archer, could shoot as far as 400 yards. This meant that good archers on a castle’s walls could effectively withstand an army far larger than their number.

Crossbow design by Da Vinci

Da Vinci Crossbow Illustration

Towards the mid-phase of the medieval period, castle walls typically included small slits made specifically for crossbow archers to launch their arrows and missiles into an approaching enemy. In some cases, crossbows were also used to launch flaming arrows into enemy lines.

Windsor Castle Arrow Slit

Such lit arrows were typically used to torch the siege engines or any other wooden siege weapons carried by the enemy armies.

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Defending a Castle Fast Facts

        • Mounted knights made surprise attacks from the castle to destroy the enemies’ catapults (Trebuchets)
        • Hidden soldiers on the walls could kick away enemy ladders
        • Counter mines could be dug to attack the attacking miners (sappers) tunnels and kill them

Medieval longbowmen armour and helmets

        • Archers fired arrows from the top of the curtain (outer) walls
        • Arrows were fired from loopholes all around the walls of the castle, at low and high levels
        • Soldiers droped rocks, boiling oil, hot sand, scolding water, etc from murders holes around the castle
        • Soldiers fired projectiles such as rocks, diseased bodies, and human excrement from catapults