In the 3rd century A.D., the Roman Empire, which also included the territory of the present day Slovenia, decided to set up special blockades preventing enemies from passing by if they advanced from the east towards the north of Italy. Strategists did not decide on a single, continuous wall, as, for example, Hadrian, but on a system of several consecutive walls built in the most exposed areas. Builders discovered an already cultured region, which is also proven by the remains of Neolithic building sites in the area of Logatec. The largest site was Velike Bukve on the Tabor in Gorenji Logatec. The building of the Roman defence walls began in the 4th century. The Logatec Basin and surrounding hills were on the most important line of advancement from the east, so special attention was paid to this region. The basin itself did not have any walls and was located between two systems of defence forts.
The first line of defence was east of the basin. The defence walls closed off all directions from Ulaka to Raskovec and further on. The walls were made of stone and defence towers were erected approximately every 100 metres for the protection of the garrison in particular. The most fortified and important post was Strmica. A special wall closed the valley beneath Brst. A fortified Roman post was built at the top of Brst probably including a permanent and relatively strong garrison.
The second line of defence was the region of Hrušica, which was difficult to cross anyhow. The Roman military road through Hrušica ensured that large numbers of Roman soldiers crossed the region since it was rather easy too defend because advancement could only be carried out via the main road.