Yet in AZ similar communication methods were used. Mirrors and flags went from quite a few locations. Picket Post Mountain near Superior was so named as one of the locations. I don’t know many others except Pinal Mountain at the head of Dripping Springs Wash. Fort Apache, near White River was a receiving location as well.
I also presume Signal Hill in our Tucson area was used for similar purposes.
I was just pointing out that the typical 50+ mile visibility we have here is better than that in North Wales....:^)