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
Education in ancient Rome more on government and politics rather than army and military. At the foundation of ancient Greek education was an effective system of formal education, but in contrast, the Romans lacked such a system until the 3rd century BC. Instead, at the foundation of ancient Roman education was, above all else, the home and family, from which children derived their so-called "moral education". Whereas Greek boys primarily received their education from the community, a Roman child's first and most important educators were almost always his or her parents. Parents taught their children the skills necessary for living in the early republic,