Investigation restarted on the northern stretch of the walls, on both sides of the central gate. The work included surveying, core sampling and excavation.

The results confirmed the previously identified phases: construction of the great wall at the time of Aristodemos, with a curtain of orthostats which faced both sides of an enormous embankment; the construction, in the second half of the 5th century B.C. of two foreparts to form a tenaille gate; the doubling of the walls in the Hellenistic period, with the creation of an outer curtain built in horizontal coursess which was further advanced towards the north and joined to the earlier wall with a series of transverse tie blocks; lastly, the extensive restoration of the Sullan period.

The previously documented evidence was integrated by the discovery of an earlier phase of the wall east of the gate, slightly set back with respect to Aristodemus’s wall, and probably constructed over the earlier town wall.

A preliminary investigation was made of the only well preserved stretch of the south walls, situated north of the Croce di Cuma. It was established that the ancient ground level outside the town walls was circa 9 m lower than the interior ground level. The existence here of a double curtain wall, certainly datable to Aristodemus’s time, was also ascertained. A forepart was added which probably served to delimit a gate, now below the modern road. The late archaic wall was then incorporated into a double curtain wall in the Hellenistic period.

Following the levelling, the inner curtain of the late archaic wall partially slipped lower down. After the dismantling of the structure, undertaken as part of the restoration process, a detailed stratigraphic investigation of the emplekton and the natural layers behind it was made. This produced important data regarding chronology and construction techniques.