Thanks for advertising this. The professor mentioned in your link says he noticed Thingwall and Brunburgh on the same ancient map. I wonder if it was this one
from Speed in the 16th century? I was struck by the same juxtaposition when I first saw this map.
I've often heard tell of Red Hill Road acquiring the name from blood trails, but it is the location of Storeton Ridge which I find most significant. Neither the Saxons nor Vikings and allies deeployed cavalry on a significant scale, so a ridge with a fine view over the heart of Wirral would be a good place to deploy a defensive formation. The ridge has Saxon lands to its rear and Danish settlements (presumably acquiescent to Viking landings) to its front. It would seem to be a natural place for an invader to land and to be met by a native army. The Saxons tribes had rarely combined before this, and they may have needed some persuading; Wirral is a more convenient focus for concentration that other suggested sites such as Northhumbria.