One of the most unusual defensive discoveries at #CastellHenllys was made by archaeologist Harold Mytum. Below one of the outer banks of the hillfort he discovered a ‘cheveaux-de-frise’ (see page 305), what Mick refers to as a ‘sort of prehistoric barbed wire’. It was particularly effective at stopping cavalry and chariots, and that’s why it extends in a band outside the gateway area, so attackers would become entangled at the point where they were in slingshot range. This feature is common in France and Spain, but relatively unknown in Britain.` #Celtic
Source: https://www.historic-uk.com/HistoryMagazine/DestinationsUK/Castell-Henllys-Iron-Age-Fort/