Hannibal, one of history's most famous generals, achieved what the Romans thought to be impossible. With a vast army of 30,000 troops, 15,000 horses, and 37 war elephants, he crossed the mighty Alps in only 16 days to launch an attack on Rome from the north. In Hannibal in the Alps, a team of experts conclusively proves for the first time that Hannibal's army did indeed cross the Alps.