The Gatehouse website record for Berkhamsted Seigeworks

In the civil parish of Berkhamsted. In the historic county of Hertfordshire (Modern Authority of Hertfordshire, 1974 county of Hertfordshire).

The outer earth works to the north and east of Berkhamstead Castle, consisting of a bank with bastions have been interpreted as the possible remains of siegeworks, the castle was attacked in 1216, the fact that they are on higher ground may support the theory of siegeworks. However Remfry suggests they are additional defences built before the siege.
Beyond the counterscarp bank to north and east is a further bank backed by seven earth bastions, perhaps the emplacement for stone-throwing engines...In 1215 the castle was to be repaired with local timber and in December 1216 it stood a fortnight's siege by Louis of France, only surrendering on the regent's orders. (Renn)

The Ordnance Survey Map Grid Reference is SP995082

Sources of information, references and further reading

This site's English Heritage (PastScape) Defra or Monument number is 346252
This site's County Historic Environment Record (formerly Sites and Monuments Record) number is 39 'grey' literature, such as watching brief reports, held by H.E.R.s is often poorly referenced and is unlikely to be recorded in this website.

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