coast, Ravenglass and Blennerhasset were probably involved from evidence of one of the earliest Roman occupations in Cumbria. Beckfoot and Maryport may also have featured early on. At some point between 72 and 73, part of Cerialis's force moved across the Stainmore Pass from Corbridge westwards to join Agricola, as evidenced by campaign camps (which may have been previously set up by Bolanus) at Rey Cross, Crackenthorpe, Kirkby Thore and Plumpton Head. Signal- or watch-towers are also in evidence across the Stainmore area - Maiden Castle, Bowes Moor and Roper Castle, for example. The two forces then moved up from the vicinity of Penrith to Carlisle, establishing the fort there in AD 72–73. Frontinus was sent into Roman Britain in 74 to succeed Cerialis as governor. He returned to the conquest of Wales interrupted years before and with steady and successful progress finally subdued the Silures in circa 76 and other hostile tribes, establishing a new base at Caerleon for Legio II Augusta (Isca Augusta) in 75 and a network of smaller forts fifteen to twenty kilometres apart for his auxiliary units. During his tenure, he probably established the fort at Pumsaint in west Wales, largely to exploit the gold deposits at Dolaucothi. He left the post in 78, and later he was appointed water commissioner in Rome. Campaigns of Agricola (AD 78–84) The new governor was Agricola, returning to Britain, and made famous through the highly laudatory biography of him written by his son-in-law, Tacitus. Arriving in mid-summer of 78, Agricola completed the conquest of Wales in defeating the Ordovices who had destroyed a cavalry ala of Roman auxiliaries stationed in their territory. Knowing the terrain from his prior military service in Britain, he was able to move quickly to subdue them. He then invaded Anglesey, forcing the inhabitants to sue for peace. The following year he moved against the Brigantes of northern England and the Selgovae along the southern coast of Scotland, using overwhelming military power to establish Roman control. Agricola in Caledonia Tacitus says that after a combination of force and diplomacy quieted discontent among the Britons who had been conquered previously, Agricola built forts in their territories in 79. In 80, he marched to the Firth of Tay (some historians hold that he stopped along the Firth of Forth in that year), not returning south until 81, at which time he consolidated his gains in the