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Vespasian took a force westwards subduing tribes and capturing oppida as he went, going at least as far as Exeter which would appear to have become an early base for the Leg. II Augusta and probably reaching Bodmin. The Ninth Legion was sent north towards Lincoln and within four years of the invasion it is likely that an area south of a line from the Humber to the Severn Estuary was under Roman control. That this line is followed by the Roman road of the Fosse Way has led many historians to debate the route's role as a convenient frontier during the early occupation. It is more likely that the border between Roman and Iron Age Britain was less direct and more mutable during this period however.
Late in 47 the new governor of Britain, Ostorius Scapula, began a campaign against the tribes of modern day Wales, and the Cheshire Gap. The Silures of south east Wales caused considerable problems to Ostorius and fiercely defended the Welsh border country. Caratacus himself was defeated in the Battle of Caer Caradoc and fled to the Roman client tribe of the Brigantes who occupied the Pennines. Their queen, Cartimandua was unable or unwilling to protect him however given her own truce with the Romans and handed him over to the invaders. Ostorius died and was replaced by Aulus Gallus who brought the Welsh borders under control but did not move further north or west, probably because Claudius was keen to avoid what he considered a difficult and drawn-out war for little material gain in the mountainous terrain of upland Britain. When Nero became emperor in AD 54, he seems to have decided to continue the invasion and appointed Quintus Veranius as governor, a man experienced in dealing with the troublesome hill tribes of Asia Minor. Veranius and his successor Gaius Suetonius Paulinus mounted a successful campaign across Wales, famously destroying the druidical centre at Mona or Anglesey in AD 60 at what historians later called the Menai Massacre. Final occupation of Wales was postponed however when the rebellion of Boudica forced the Romans to return to the south east. The Silures were not finally conquered until circa AD 76 when Sextus Julius Frontinus' long campaign against them began to have success.
Read more about this topic: Roman Conquest Of Britain, 44