Cassius Dio
In Plutarch's account, the battle was fought over two days. In the accounts of Cassius Dio and Dionysius of Halicarnassus it lasted one day. According to Plutarch the battle was won by Pyrrhus, according to Cassius Dio, it was won by the Romans. Dionysius of Halicarnassus did not state what the outcome of the battle was.