Battle of the Silarus
211 BCE.
Shown on the map at 40.482°, 14.943°.
The Battle of the Silarus was fought in 212 BC between Hannibal's army and a Roman force led by centurion Marcus Centenius Penula. The vastly outnumbered Carthaginians were victorious, destroying the entire Roman army and killing 15,000 Roman soldiers in the process.
Text from the Wikipedia article Battle of the Silarus, licensed CC BY-SA 4.0.