Just above the harbour you can find the village St. Martin's Battery, it was part of an old fortification.
At this location were several heavy guns placed to protect the harbour of Dover and the rest of the English coast, as well to attack enemy ships in the Canal. They where not allowed to fire to the coast of France as an answer to German shellings because that would result in more shellings on Dover.
The gun's where placed on an already existing fortification from long ago and the old available buildings where made suitable for there new task, so you find old and new works mixed up.
For more information see the original article.
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