Hannibal, or Hannibal Barca, as he's also known, was a great Carthaginian general and leader who inflicted a string of crushing defeats on the forces of Rome throughout the third century BC.
The greatest of these defeats, the Battle of Cannae in 216 BC, was one of the most disastrous military reversals in Roman history and greatly enhanced Hannibal's reputation as a general and a leader.
What made Hannibal such a formidable opponent was his tactical ingenuity and flexibility. The most famous example of this comes in Hannibal's use of war elephants, which were employed to devastating effect against the Romans.
Hannibal was also adept at using pincer movements, simultaneous attacks from both sides, against the enemy. The pincer movement was a particularly effective tactic at Cannae, when the Roman soldiers involved in the battle were completely surrounded and all but a handful of them wiped out. This was despite the fact that the Romans enjoyed numerical superiority over the Carthaginians.
But Hannibal was not a perfect general or leader by any means; he made more than his fair share of mistakes. His greatest weakness was arguably his lack of strategic sense.
Due to Hannibal's remarkable victories over the Romans, the great city of Rome lay before him, poorly defended and ripe for the taking. And yet, Hannibal didn't attack. Even though he and his formidable forces were only eighty miles away from Rome, Hannibal failed to press home his advantage, a decision he would later describe as the greatest mistake of his life.
For all Hannibal's skills as a tactician, he had a very limited understanding of strategy. He unthinkingly held to the dominant strategic principle that in order to force the enemy to seek terms, all one had to do was invade his territory, win some battles, and cause a sufficient amount of disruption. Once these objectives had been achieved, so the thinking went, the enemy would have no choice but to come to the negotiating table.
But in making this unwarranted assumption, Hannibal failed to realize that the Romans had a completely different understanding of strategy. The Romans, who regarded the Hellenistic Carthaginians as an inferior, over-refined race, were never about to negotiate with Hannibal; they would, if necessary, keep on fighting to the bitter end.
If Hannibal had broken free from the narrow strategic consensus that existed at that time in Carthage, he may well have taken the opportunities his great victories had brought him and destroyed Rome and its civilization completely.