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
Cannae Cannen(sis) (Latin adjective). It has had the following incumbents, of the fitting Episcopal (lowest) rank, "with an archiepiscopal exception : Cannae Cannae (now Canne della Battaglia) is an ancient village of the Apulia region of south east Italy. It is a "frazione" (civil parish) of the "comune" (municipality) of Barletta, a former bishopric and presently a Latin Catholic titular see. It is situated near the river Aufidus (the modern Ofanto), on a hill on the right (i.e., south) bank, southwest from its mouth, and 9 km southwest from Barletta. It is primarily known for the Battle of Cannae, in which