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
Tiberius Sempronius Gracchus (consul 215 BC) Tiberius Sempronius Gracchus (consul 215 BC) Tiberius Sempronius Ti. f. Ti. n. Gracchus (died 212 BC) was a Roman Republican consul in the Second Punic War. He was son of Tiberius Sempronius Ti. f. Gracchus, who was apparently the first man from his branch of the family to become a consul. Gracchus is first mentioned in 216 BC as a curule aedile, in which capacity he was inducted as the Master of the Horse to the newly elected Dictator Marcus Junius Pera after the defeat at Cannae. He was elected consul in 216 BC, at the recommendation of the Dictator,