There seems to have been a northern campaign to Britannia that was aborted. This campaign is derided by ancient historians with accounts of Gauls dressed up as Germanic tribesmen at his triumph and Roman troops ordered to collect seashells as "spoils of the sea". The few primary sources disagree on what precisely occurred. Modern historians have put forward numerous theories in an attempt to explain these actions. This trip to the English Channel could have merely been a training and scouting mission. The mission may have been to accept the surrender of the British chieftain Adminius. "Seashells", or "conchae" in Latin, may be a metaphor for something else such as female genitalia (perhaps the troops visited brothels) or boats (perhaps they captured several small British boats).