Sorry, actually the battle lasted five days. One may note that each battle Hannibal won he used the enemy's own momentum against them. Indirectly Hannibal picked the day, time, ground, and even the Roman commander he faced. However, he led the Romans to believe, that all the factors were in their favor, and they were making all the discussions based on logic. On top of this on the battle field he laid all his cards out on the table for the Roman commander to clearly see. Yet, he did this in a manner to obscure his true counter-offensive intent.
For example, he massed most of and his best horse on his left next to the Autidus River so the Romans could see there was little room for maneuver. So they did not think they would be a threat during the fight. Still this was the key Hannibal used to win the battle and destroying the Roman field force. Instead if he had massed this horse on his right, the Romans would have immediately perceived the danger.
Also the escape of Publius Cornelius Scipio (AM) from the battle field (this was the third time) set in motion the events that lead to Hannibal's defeat at Zama, and in turn the defeat of Carthage.
CmacQ
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