The Roman terminus stood between Forth and Clyde for a few years only. The wild Caledonians--‘Picts,’ as perhaps the Roman troops were already calling them--saw their independence threatened now as formerly by Agricola. About 155 the irrepressible Brigantes again broke out into rebellion. They were only subdued after a fierce struggle, during which the garrison of the northernmost wall must have been largely recalled. The result was the gradual abandonment of the recently occupied territory. The Caledonians raided through the ill-occupied wall, inflicted at least one severe defeat on a Roman force, and, as excavations appear to show, stormed some of the forts. By about 190 the frontier was again at Hadrian’s Wall, with advanced stations at Habitancum (Risingham) and Bremenium (High Rochester), respectively twelve and twenty miles from Corstopitum (Corbridge), just south of the Wall, Castra Exploratorum (Netherby), and one or two other places. So, after every effort, the ‘British Enterprise’ ended in an unsatisfactory compromise. The Roman frontier was neither ethnic nor natural, and the wretched Britons between Roman and Pict were literally between hammer and anvil. In 196-197 the governor, Decimus Clodius Albinus, took almost the entire army to Gaul to contest the Empire with Severus I. He was defeated and slain at Lugdunum (Lyons), and the troops returned to Britain; but they must have suffered very heavily, besides being thoroughly discontented with the Emperor, who had slain their own commander. This weakness and disorganization gave the wild Caledonians too good an opportunity to be missed. They appear to have occupied the territory north of the Wall, and even to have crossed the fortified line itself.