The Battle of Camulodunum, also known as the Massacre of the Ninth Legion, was the major military victory of the Iceni and their allies over an organised Roman army during the revolt of Boudica against the Roman occupation of Britain. A large vexillation of the Legio IX Hispana were destroyed by the rebels. While attempting to relieve the besieged colonia of Camulodunum (Colchester, Essex), legionaries of the Legio IX Hispana led by Quintus Petillius Cerialis, were attacked by a horde of British tribes, led by the Iceni. Possibly 80% of the Roman foot-soldiers were killed in the battle. The event is recorded by the historian Tacitus in his Annals.