According to Josephus, Agrippa had intended to construct a wall at least 5 meters thick, virtually impregnable to contemporary siege engines. Agrippa, however, never moved beyond the foundations, out of fear of emperor Claudius "lest he should suspect that so strong a wall was built in order to make some innovation in public affairs."[67] It was only completed later, to a lesser strength and in much haste, when the First Jewish–Roman War broke out and the defences of Jerusalem had to be bolstered. Nine towers adorned the third wall.