The part of the Hellenistic fortification, which is included in the borders of the mole of the Windmills, constitutes the continuity of the branch of autonomous fortification towards SW-NE at the east of the "great port" of antiquity, which included two or, possibly, three cylindrical towers and a gate towards the Acandia cove. The wall, with the stone pier towards the interior of the port, was turned towards the north at the height of the eastern mole, at a length of 120 m. Then it was transformed into an enhanced fortified formation with two massive square towers and regularly arranged transverse counterforts in between, which obviously supported the side road by enforcing the wall. This powerful fortification front also formed, at the same time, the north ending of the eastern mole, around which a massive rock fill protected the constructions from stormy winds.