In 216 BC, on a dusty plain in southern Italy, Hannibal Barca orchestrated the most tactically flawless battle in recorded history — and still lost the war. This episode breaks down the Battle of Cannae, where a Carthaginian army of 50,000 lured a Roman force of 86,000 into a double envelopment so complete that soldiers were packed too tightly to raise their own swords. By the time the sun set, up to 600 Romans were dying every minute — a death toll historians compare to the first day of the Battle of the Somme.

But Cannae's real legacy isn't the slaughter. It's what came after: how Rome refused to surrender despite losing a fifth of its adult male population, how a young tribune named Scipio held a sword over fleeing nobles and forced them to swear a blood oath to their city, and how 14 years later that same man defeated Hannibal at Zama.  ...