Hannibal crossed over from Carthage to Spain and over the Alps into Italy in 218 BC.
Despite losses "...terror and chaos of snowstorms, screaming elephants, landslides and
hostile tribesmen hurling a deadly rain of missiles down from mountain crags...somehow
Hannibal rallied his men, lifted their morale and retained their loyalty..."
and spent 16 years battling the Romans and not once defeated.
Read about this in the page entitled "The Incomparable Hannibal — A Personal View" by Dennis Price