Eutropius, Abridgement of Roman History — Book III (1886<!-- translation -->)
“ The war was carried by Scipio, and Masinissa, another king of the Numidians, who had made an alliance with Scipio, to the very walls of Carthage. Hannibal sent three spies into Scipio's camp, who were captured, and Scipio ordered them to be led round the camp, the whole army to be shown them, and themselves to be entertained and dismissed, that they might report to Hannibal all that they had seen among the Romans. ”
