These were posted at the two extremities of the line, where it was depressed; while the centre, where the Gauls and Spaniards were placed, projected a little.

When the wedge thus formed being driven in, at first rendered the line level, but afterwards, by the pressure, made a curvature in the centre, the Africans, who had now formed wings on each side of them, surrounded the Romans on both sides, who incautiously rushed into the intermediate space; and presently extending their wings, enclosed the enemy on the rear also.
After this the Romans, who had in vain finished one battle, leaving the Gauls and Spaniards, whose rear they had slaughtered, in addition commence a fresh encounter with the Africans, not only disadvantageous, because being hemmed in they had to fight against troops who surrounded them, but also because, fatigued, they fought with those who were fresh and vigorous.
48.

Now also in the left wing of the Romans, in which the allied cavalry were opposed to the Numidians, the battle was joined, which was at first languid, commencing with a stratagem on the part of the Carthaginians.

About five hundred Numidians, who, besides their usual arms, had swords concealed beneath their coats of mail, quitting their own party, and riding up to the enemy under the semblance of deserters, with their bucklers behind them, suddenly leap down from their horses; and, throwing down their bucklers and javelins at the feet of their enemies, are received into their centre, and being conducted to the rear, ordered to remain there; and there they continued until the battle became general.

But afterwards, when the thoughts and attention of all were occupied with the contest, snatching up the shields which lay scattered on all hands among the heaps of slain, they fell upon the rear of the Roman line, and striking their backs and wounding their hams, occasioned vast havoc, and still greater panic and confusion.