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
Roger of Cannae Martyrology. Roger of Cannae Saint Roger of Cannae (1060 – December 30, 1129) was an Italian bishop. The Catholic Church honours him as a saint. Roger (in Italian: "Ruggero di Canne") was elected bishop of the town of Cannae, where a small diocese already had risen in the 10th century. In 1083 there was the destruction by Robert Guiscard, king of the Normans. Roger contributed to the moral and material reconstruction of the ancient city of Apulia, supporting his fellow citizens with the consolations of faith and the material aid. The "Cannes Anonymous", an ancient local biographical sources of the