A dendrochronological dating of the wood enables us to say that the fort was built after the state visit of Caligula to Germania Inferior in AD 40-41. The wooden building was meant to protect the ‘limes’; the Roman border consisting of the Rijn. Caligula built this fort with the idea of crossing over to Great Britain; this was not accomplished during his reign, although his successor Claudius succeeded. The building was an isolated outpost, few colonies were located nearby. The complex was exclusively made of wood. It had wooden outer walls and wooden watchtowers. Outside the walls canals were dug. This wall was approximately a hundred and twenty meters long and eighty meters wide. During the Revolt of the Batavi (between AD 69 and 70) the wall was demolished by the Cananefates; this was later rebuilt after the rebellion had been quelled. Around 160 AD, the wooden wall had been replaced by a brick wall. It was around this time that a new entrance gate was built, carrying an inscription referring to Emperor Septimius Severus. The reason for this was that Emperor Severus himself had given the order to repair the damages inflicted on the wall. During its glory days, the army camp consisted of approximately four hundred soldiers.