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
Ordona economic decline began during the 4th Century BC. The construction of defensive walls during this period suggests a period of battles with other centres in the region, probably comprising clashes with the Greek Hegemonic Cities in the territory, among them neighbouring Taranto. It passed over to the Romans, with the rest of Apulia, after the wars of the Greek-Messapian League, commanded by King Pirro of Epiro (280-275 BC). Herdonia was a protagonist during the Second Punic War (219-202 BC) and in particular, during the events linked to the war's most famous battle at Cannae on 2 August 216 BC. According