The Battle of Cannae took place in the 2nd Punic Wars in 216 BC. The army of Carthage was under Hannibal and the Romans were under consuls Lucius Amelilius Paullus and Gaius Terentius Varro. Hannibal surrounded and defeated the large Roman army. It became known as one of the worst defeats in Roman history. The Roman army was around 86,000. Hannibal used the double-envelopment tactic.