According to the Anglo-Saxon Chronicle, the Roman Saxon Shore fort of Anderida, known to the Romans as Anderitum and situated at what is now Pevensey in East Sussex, was stormed by Saxons in 491. The British garrison and inhabitants were exterminated, making the event one of the most complete destructions recorded in the post-Roman history of Britain. The fort had been the largest of the nine Saxon Shore forts, its walls and towers being the largest of any surviving Roman fort of the period, yet neither its formidable scale nor its naturally defensive position on a peninsula projecting into a tidal lagoon proved sufficient to protect those sheltering within it.
The Anglo-Saxon Chronicle records that Anderida was stormed by Saxons in 491 and that the British garrison and all its inhabitants were exterminated, leaving not a single Briton alive within what had once been the mightiest of Rome's Saxon Shore fortifications.
The entire British garrison and inhabitants were killed
The size of the opposing forces is not recorded in the surviving sources.
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