The Wierickerschans Fort is a part of the Old Dutch Waterline or "Oude Hollandse Waterlinie". This was a defence system that allowed large parts of the country to be flooded . Thus protecting the main towns and city in the West against invading forces from the East. It was in use right up to the 19th century. The Fort was built on the site where in 1672 Stadtholder Willem III had his headquarters during the war against the French. The Fort is centrally located within the Old Dutch Waterline that stretched from Muiden down to the Biesbosch.
In the "disaster year" of 1672 the Netherlands was at war with France, England, Munster and Cologne. In June of that year the French attacked the province of Gelderland and conquered several neglected fortified towns. The cities of Utrecht and Woerden were occupied, but to the West the enemy encountered the inaccessible body of water of the Old Dutch Waterline. The water stretched from Muiden on the Zuiderzee down to the Biesbosch. On higher ground reinforcements were situated.
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