In 19 BC, the Romans founded a legionary base on the Hunerberg, east of Batavodorum (modern Nijmegen, Netherlands), the capital of the Batavians. Even when the legions were transferred and the soldiers’ expenditure disappeared as a source of income, this civil settlement continued to flourish.
As is well known, the Batavians revolted during the Year of the Four Emperors. Tacitus writes that when the Roman general Cerialis arrived to restore order in 70, the rebels set fire to Batavodurum (Histories 5.19). The Roman historian also says that the site was occupied by the Second Legion Adiutrix (5.20). Archaeologists had already established that the civil settlement, Noviomagus, was rebuilt a bit more to the west.
Recently, Dutch archaeologist Harry van Enckevort has identified the remains of a praetorium and a ditch of a hitherto unknown fortress. The absence of objects from the Flavian period suggests that it was built immediately after the revolt had been suppressed, which can only mean that its inhabitants were soldiers of II Adiutrix. Built on the ash layer of Batavodurum, the fortress controlled a new civil settlement.
The stone foundations of the praetorium prove that II Adiutrix was supposed to stay in Nijmegen. Eventually, however, it followed Cerialis to Britain and was replaced by X Gemina, which reoccupied the Hunerberg.
[Also published in Ancient Warfare; thanks to Harry van Enckevort]