Defence in depth in order to retreat successfully, and they assume that the defender's morale will recover from the retreat. A possible early example of this came at the Battle of Cannae in 216 BC, when Hannibal employed this manoeuvre in order to encircle and destroy eight Roman legions, but that is disputed by some historians. Edward Luttwak used the term to describe his theory of the defensive strategy employed by the Late Roman army in the 3rd and 4th centuries AD. Later examples of defence in depth might be European hill forts and the development of concentric castles. In those examples, the
Religion in ancient Rome Venus was brought from Sicily and installed in a temple on the Capitoline hill. The disasters of the early part of Rome's second Punic War were attributed, in Livy's account, to a growth of superstitious cults, errors in augury and the neglect of Rome's traditional gods, whose anger was expressed directly in Rome's defeat at Cannae (216 BC). The Sibilline books were consulted. They recommended a general vowing of the "ver sacrum" and in the following year, the burial of two Greeks and two Gauls; not the first or the last of its kind, according to Livy. The introduction of