Titus Livius (Livy), The History of Rome, Book 30
Cyrus Evans, Ed.

29. Hannibal had by this time arrived at Adrumetum; [p. 1318]from which place, after employing a few days there in refreshing his soldiers, who had suffered from the motion by sea, he proceeded by forced marches to Zama, roused by the alarming statements of messengers, who brought word, that all the country around Carthage was filled with armed troops. [2] Zama is distant from Carthage a five days' journey. Some spies, whom he sent out from this place, being intercepted by the Roman guard, and brought before Scipio, he directed that they should be handed over to the military tribunes, and, after having been desired fearlessly to survey every thing, to be conducted through the camp wherever they chose; [3] then, asking them whether they had examined every thing to their satisfaction, he assigned them an escort, and sent them back to Hannibal. [4] Hannibal received none of the circumstances which were reported to him with feelings of joy; for they brought word that, as it happened, Masinissa had joined the enemy that very day, with six thousand infantry and four thousand horse; but he was principally dispirited by the confidence of his enemy, which, doubtless, was not conceived without some ground. [5] Accordingly, though he himself was the originator of the war, and by his coming had upset the truce which had been entered into, and cut off all hopes of a treaty, yet concluding that more favourable terms might be obtained if he solicited peace while his strength was unimpaired, than when vanquished, he sent a message to Scipio, requesting permission to confer with him. [6] I have no means of affirming whether he did this on his own spontaneous suggestion, or by the advice of his state. [7] Valerius Antias says, that after having been beaten by Scipio in a battle, in which twelve thousand armed men were slain, and one thousand seven hundred made prisoners, he came himself with ten other deputies into the camp to Scipio. [8] However, as Scipio did not decline the proposal for a conference, both the generals, by concert, brought their camps forward in order to facilitate their meeting by shortening the distance. [9] Scipio took up his position not far from the city Naragara, in a situation convenient not only for other purposes, but also because there was a watering place within a dart's throw. [10] Hannibal took possession of an eminence four miles thence, safe and convenient in every respect, except that he had a [p. 1319]long way to go for water. Here, in the intermediate space, a place was chosen, open to view from all sides, that there might be no opportunity for treachery.