[3] Rapidum was a large agglomeration; Composed of families of soldiers and could have a population, estimated at more than 8 500 inhabitants.

The three military posts were constructed on the basis of a geographical study to allow for a rapid connection, taking into account the location of each post in relation to the other, designed to defend Auzia against repeated attacks by the Bavars (a Berber tribe, Also known as the Quinquagesimes or the five federated tribes from the regions of Djurdjura, the Babors and the Bibans.

The Ruins are protected by the APC which had erected a fence in 1996 to preserve the stones (rectangular form) were ransacked and stolen for use in constructions.

Djouab is the ancient Roman city of Rapidum, in the province of Mauretania Caesarean, identified by inscriptions which indicate its name and rank of municipality.

The site was recognized by the archaeologist Adrien Berbugger in 1845, and Henri Choisnet found in 1882 the gates of the city.