The Ordovices had ambushed and destroyed a cavalry regiment just before Agricola arrived in Britain. Though it was near the campaigning season's end, Agricola immediately marched into their mountains and, according to Tacitus (his son-in-law), destroyed almost the entire tribe. The language is stark: Tacitus says he wanted to set a terrifying example at the outset of his command. This was followed immediately by the reconquest of Anglesey.
Near-total destruction of the Ordovican fighting force (per Tacitus)
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