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Medieval castle the Muiderslot

The Muiderslot is one of Holland’s best preserved medieval castles. It’s a real medieval castle with a moat, like a kid would draw it – complete with towers, battlements, arrowslits and a drawbridge.
The castle was built in 1285 by well-know medieval count Floris V, who was later murdered in the vicinity of the town of Muiderberg. Its most famous inhabitant was P.C. Hooft, one of the founders of a serious literary culture in the Dutch-speaking region.

The Muiderslot is fun for young and old alike. You can climb the highest tower, go on a guided tour, stroll through historical gardens and participate in quests and games. Most exciting of all are the flight demonstrations with birds of prey and the falconry stories told by the castle’s falconer. You can make a visit to the Muiderslot even more of an experience by travelling to and from the castle by ferry. Another option is to combine a visit to the stronghold with a boat trip to the Fort along Pampus or a peak at the historical exhibition on the fortified town of Muiden that is presented in the Muizenfort (literally: Mice Fortress).

Part of the fortified town Muiden

The Muiderslot was included in the Defense Line from 1892 till 1922, as part of the fortified town Muiden. The castle is strategically placed south-east of Amsterdam, where the river Vecht meets the previously known Zuiderzee, now called the Ijmeer. The fortified town Muiden, together with fort island Pampus, formed the support points for the main defence line in the area of Muiderberg.

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Passable part of an inundation in the form of elevated terrain, a road, (railway) embankment or waterway.

Collective term for projectile weapons.

Also called bulwark. An outward-projecting pentagonal structure, suitable for delivering flanking fire.

A storage site for military equipment. The parks in the Defence Line are spread out over sectors (sector parks) and groups (group parks).

A battery that is positioned behind armour plates.

A fort with one or more armoured artillery positions.

A number of artillery pieces combined into one group.

Shielded position from which defenders can harass the enemy.

A (low) defensive structure that extends into the moat and can be used to give flanking fire.

A space that is protected against enemy fire and is outfitted with a gun port, behind which a piece of artillery is placed.

An army division whose tasks include, amongst other things, the construction of temporary and permanent defensive structures. The term ‘engineer’ is derived from the French word ‘ingenieur’.

Also called covert way. A pathway that is protected from enemy fire by an earthen wall and can be used for transporting soldiers and military equipment.

Also called stop-log sluice. A temporary dam that stops the inundation water when beams are stacked up in its recesses.

Water purification system that improves the quality of drinking water by extracting iron.

Earthen elevation surrounding a defensive structure, featuring a breastwork.

A (wooden) shed where artillery and military engineering equipment were stored.

The part of a terrain that can be fired at.

Long-range flanking fire: fire support for the secondary forts. Short-range flanking fire: fire that covers the surroundings of the defensive structure itself.

Known in Dutch as ‘Vestingwet’. The act of the 18th of April 1874 that stipulated which forts would become part of the Dutch national defence system.

The side of a defensive structure that is facing away from the enemy.

In the Defence Line forts this is a casemate giving short-range and long-range flanking fire.

Undercarriage for a cannon or other heavy firearm.

Shell that is filled with highly explosive material.

The flooding of land to keep the enemy at bay.

Also called inlet sluice. A sluice that is constructed with the aim of letting water into a certain area.

An independent system of connected defensive structures.

Artillery that gives frontal fire over large distances, directly aimed at enemy positions.

A simple (temporary) defensive structure manned by a small number of soldiers.

An underground connecting passageway that is shellproof.

Known in Dutch as ‘Kringenwet’. Act of January 1853 that stipulates restrictions with regard to the construction of buildings in the vicinity of defensive structures, the so-called forbidden zones (‘kringen’), in order to guarantee a free field of fire.

A chart that is installed next to the gun port to give the operators of the artillery insight into the distances of targets and the corresponding firing angles.

A place of last refuge for the defenders of a fort, which can be defended independently.

A turret that is lifted up to give fire and is retracted and thus made almost invisible once the firing has stopped.

Position that provides shelter to retreating troops.

Battery that is situated in close proximity to a fort and performs some of the tasks that have been assigned to that fort.

The ability of a building to withstand gunfire thanks to brickwork, concrete or a bottom layer.

A shellproof depot for storing artillery and other essential military equipment.

A fort’s courtyard.


A turnable armoured artillery position.