But they were swift of foot, the woods sheltered and the hills defended them.

He made no more effectual pursuit than Cumberland did at Culloden.
Agricola was recalled by Domitian after seven years' warfare, and his garrisons did not long hold their forts on his lines or frontier, which stretched across the country from Forth to Clyde; roughly speaking, from Graham's Dyke, east of Borrowstounnis on the Firth of Forth, to Old Kilpatrick on Clyde.

The region is now full of coal-mines, foundries, and villages; but excavations at Bar Hill, Castlecary, and Roughcastle disclose traces of Agricola's works, with their earthen ramparts.

The Roman station at Camelon, north-west of Falkirk, was connected with the southern passes of the Highland hills by a road with a chain of forts.
The remains of Roman pottery at Camelon are of the first century.
Two generations after Agricola, about 140-145, the Roman Governor, Lollius Urbicus, refortified the line of Forth to Clyde with a wall of sods and a ditch, and forts much larger than those constructed by Agricola.

His line, "the Antonine Vallum," had its works on commanding ridges; and fire-signals, in case of attack by the natives, flashed the news "from one sea to the other sea," while the troops of occupation could be provisioned from the Roman fleet.