4.23
At this juncture the 500 Celtiberians, seeing that the expected opportunity had come, drew their daggers from their bosoms and first slew those who were just in front of them, then, seizing the swords, shields, and spears of the dead, made a greater onslaught against the whole line, darting from one to another indiscriminately, and they accomplished all the greater slaughter inasmuch as they were in the rear of all. Now were the Romans in great and various trouble, assailed by the enemy in front, by ambuscades in flank, and butchered by foes amid their own ranks. They could not turn upon the latter on account of the pressure of the enemy in front and because it was not easy to distinguish these assailants, for they had possessed themselves of Roman shields. Most of all were they harassed by the dust, which prevented them from even guessing what was taking place. But (as usually happens in cases of disorder and panic) they considered their condition worse than it was, the ambuscades more dreadful, and the 500 more numerous than 500. In short, they imagined that their whole army was surrounded by hostile cavalry and deserters. So they turned and broke into headlong flight, first those on the right wing where Varro himself led the retreat, and after them the left wing, whose commander, Servilius, however, went to the assistance of Aemilius. Around these the bravest of the horse and foot rallied, to the number of about 10,000.
