Due to the reduction of the military forces in the 2nd half of the 4th century the former military camp was handed over to the civilian population in need of protection. For the remaining number of soldiers a small fortlet was built on the north western edge. This very “Burgus” offered room for about 50 men.
The construction had a dimension of 20m per 21m and was accessible from the camp’s side only through a recently restored gate.
In contrast to the massive outer walls the inner wooden construction could not be preserved. The four hook-shaped foundations in the centre bore wooden pillars which carried the beams and the tiled roof. They formed a little inner courtyard which granted air and light.