http://www.romanfrontier.eu/en/places/biriciana-roman-weissenburg

The first soldiers of Ala I Hispanorum Auriana reached the area of modern Weißenburg around AD 100. The surrounding countryside provided ample building materials for them to build a large timber fort with barracks and defences. One of the tasks of the newly established fort was to control and protect the road running from AELIA AUGUSTA – Augsburg to MOGONTIACUM – Mainz. Cavalry units such as that stationed at BIRICIANA were extremely flexible and could operate across long distances. Around the mid 2nd century AD the fort was rebuilt in stone. At the same time, it was enlarged slightly. Shortly after this rebuilding, the Limes itself was restructured and fortified with a palisade.