Would be very interested to hear your theory on how this was done - especially as I'm told that the 'conventional' method (using a straightforward wood fire) would have required more timber than could actually have been growing on the hill the fort tops . . .
Beyond this, the other fascinating question is WHY was it done?
I've heard that to make a 7ft wall by this method would have required the building of a 20ft+ initial wall, and the end result would be a less secure fortification than a standard stone wall.
The whole thing is more than a little strange however you look at it, and I'm surprised there isn't considerably more speculation and interest in this process.
All 'facts' here came from a local archeologist some time ago, so hopefully still as relevant and accurate as possible . . .
Something is not right. This message is just to keep things from messing up down the road