Why did Hasdrubal’s defeat at the Battle of the Metaurus change the course of the war?

The defeat of Hasdrubal at the Battle of the Metaurus in 207 BCE was a decisive turning point in the Second Punic War because it effectively ended the threat of a combined Carthaginian offensive against Rome.12

Hasdrubal had marched from Spain to Italy with a significant force, intending to join his brother, Hannibal, for a direct assault on the Roman capital. By intercepting and destroying Hasdrubal’s army, the Roman consuls Gaius Claudius Nero and Marcus Livius Salinator prevented this strategic union.12

The loss of Hasdrubal’s reinforcements and his subsequent death meant that Hannibal, who had been waiting in southern Italy, could no longer hope to receive the support necessary to undertake a major offensive. Consequently, the campaign of 207 BCE decided the war in Italy; while Hannibal maintained his position for a few more years, he was gradually forced into the southern tip of the peninsula until he was eventually recalled to Africa.1