Yes, exactly that. The poor buggers up top would freeze. I lived near a couple of beacon hills in Worcs, and was at this beacon-site https://www.crichparish.co.uk/newwebpages/crichbeacon.htm l for the quadricentenary of the Armada, and you don't need to be on a giant mountain to see a distant bonfire at night.

But the visual in the film was just stunning, I'll grant you that.