 Between 117 and 119, there may have been a war with the Britons, perhaps in the western part of the northern region, involving the tribes in the Dumfries and Galloway area.The response was to provide a frontier zone in the western sector of forts and milecastles, built of turf and timber (the "Turf Wall"), the standard construction method (although some have suggested it was because "turf and timber were preferred on the Solway plain, where stone is scarce").For whatever reason, this was not enough for the emperor Hadrian (emperor 117 AD – 138 AD).