Tacitus records that the Ordovices destroyed a Roman cavalry ala shortly before Agricola arrived as governor. Agricola immediately launched a punitive campaign without waiting to gather his full force, destroying virtually the entire Ordovices tribe in battle. Tacitus uses the word prope universos — almost the entire people — suggesting mass slaughter. Agricola then retook Anglesey without boats, using the tide.
Ordovices: near-total military casualties according to Tacitus
Agricola with legionary vexillation and auxiliaries
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