The Roman siege system of Masada: a 3D computerized analysis of a conflict landscape | Journal of Roman Archaeology | Cambridge Core

Our analysis, based on a thorough survey, ground-level recording, and a digital photogrammetric 3D model, shows that the construction of both the wall and the camps around Masada took about two weeks. This supports Roth's argument for a four-to-nine-week siege.

The circumvallation was also built as a means of psychological warfare against the besieged. In fact, the sections above the south and west cliffs were built only to lower the defenders’ morale and to function as a symbol of Roman might.

The audience for the psychological warfare may also have been the Roman soldiers themselves – Levithan showed that the Roman legions besieging Jerusalem only a few years prior were not an unstoppable war-machine; in fact, their commanders did not have full control over them, as soldiers avoided dangerous circumstances and officers had to persuade them to volunteer for more dangerous missions.

The impressive circumvallation around Masada probably helped the Roman army's morale by boosting soldier confidence – an important factor in ancient warfare.