Why Was Hannibal Defeated?

Hannibal's forces were defeated on the field at the Battle of Zama by Scipio's brilliant manipulation of the Carthaginian's own tactics but the groundwork for this defeat was laid throughout the Second Punic War through the Carthaginian government's refusal to support their general and his troops on campaign in Italy.

What led to the downfall of Hannibal?

Hannibal felt betrayed by Carthage after Cannae. ... As with many of history's great field commanders, Hannibal had succumbed, at least in part, to his enemy's superior logistics. Hannibal's accusation that the Carthaginian Senate had failed to send him critical supplies and troops when most needed was dead on.

Why did Hannibal ultimately fail to defeat the Romans?

A major reason for this was that Hannibal was far less skilled at sieges than field battles. ... Here Hannibal had hoped to take the Roman-leaning city quickly so that he could invade Italy without an enemy at his back. Initial assaults failed, and the siege ran on far longer than Hannibal had hoped.