His whole army having been got ready for battle, he confined the main body within his camp, but sent out the velites and some picked men of the infantry with orders to assault the brow of the hill and attack the enemy’s pickets. His orders were carried out with great spirit. At first the Carthaginian commander watched what was happening without stirring: but when he saw that, owing to the fury of the Roman attack, his men were being hard pressed, he led out his army and drew them up along the brow of the hill, trusting to the strength of the position. Meanwhile Scipio despatched all his light-armed troops with orders to support the advanced guard: and the rest of his army being ready for action, he took half of them under his own command, and going round the brow of the hill to the enemy’s left, began assaulting the Carthaginians; while he entrusted the other half to Laelius, with orders to make a similar attack on the right of the enemy. While this was going on, Hasdrubal was still engaged in getting his troops out of camp: for hitherto he had been waiting, because he trusted in the strength of the position, and felt confident that the enemy would never venture to attempt it. The attack, therefore, took him by surprise, before he was able to get his men on to the ground. As the Romans were now assaulting the two wings of the position which the enemy had not yet occupied, they not only mounted the brow of the hill in safety, but actually advanced to the attack while their opponents were still in all the confusion and bustle of falling in. Accordingly they killed some of them on their exposed flank; while others, who were actually in the act of falling in, they forced to turn and flee. Seeing his army giving way and retreating, Hasdrubal reverted to his preconceived plan; and determining not to stake his all upon this one desperate hazard, he secured his money and his elephants, collected as many of his flying soldiers as he could, and commenced a retreat towards the Tagus, with a view of reaching the passes of the Pyrenees and the Gauls in that neighbourhood. Scipio did not think it advisable to pursue Hasdrubal at once, for fear of being attacked by the other Carthaginian generals; but he gave up the enemy’s camp to his men to pillage.