“Trouble in Britain is to be connected with the issue of victory coins in 119 and the fact that by 122 the IXth Legion was replaced at York by the VIth and disappeared from the army list thereafter. That the legion was cashiered, there is no doubt, and it seems evident that this fate, at the hands of the disciplinarian Hadrian, followed an ignominious defeat. But the unit was not anihilated. Some of its officers at least survived and nothing whatever is reported of the circumstances or place of the trouble.”
Book:Roman Britain