> Surely, Glasswall is a vitrified fort! (there do appear to be
> Arthurian glass walled forts so the Greg connection is possible).
> Thoughts? Everybody else always been aware of these and just never
> told me.
I've come across the idea before, that this was a deliberate defensive strategy. I'm pretty sure that it's mentioned in passing, in some of the Roman annals, although of course interpretation of such brief remarks is a dodgy business (aristotles claw being a case in point).
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