 But Antoninus failed to secure control of southern Scotland and the Romans returned to Hadrian's Wall, which was re-furbished, in 164 AD, after which garrisons were retained there until the early 5th century.The Wall had cut the Carvetti's territory in half and it is possible that there was a certain amount of local raiding and uncertainty derived from them and possibly other local tribes to the north of the Wall.The early 160s saw troubles of some kind on the northern frontier.