Hasdrubal Barca. They set off together and encamped near Amtorgis in sight of the enemy on the other side of a river. Publius Scipio then moved on. Hasdrubal Barca realised that his opponents depended on the Celtiberians and set out to get them to defect. The Celtiberian chieftains were offered a large bribe to withdraw their forces. With this prospect to get equal money to go home, they left. Gnaeus Scipio withdrew as far as he could. The enemy had crossed the river and was pursuing him. Meanwhile, Publius Scipio had to face the arrival of Masinissa and his Numidians. Masinissa sought to check the Roman advance with constant attacks by day and night. This cut off the foragers. He also rode to the Roman outposts causing alarm and confusion. He often charged the ramparts at night. Indibilis was approaching with 7,500 Suessetani (who lived in today's western Aragon) to help the Carthaginians. The situation was developing into a siege. Publius Scipio was forced to risk advancing on Indibilis at night. When daylight came, he was having the better in an irregular battle fought in order of march rather than of battle. However, the Numidians showed up and swept around both flanks. The Carthaginian commanders also arrived and attacked the rear. Publius Scipio was killed by a lance. The Romans fled and were pursued; more were killed in the rout than in the battle. Night brought the carnage to an end. Hasdrubal and Mago went to join Hasdrubal Barca by forced marches, thinking that their joint forces would bring the war to a close. Gnaeus realised that his brother had been defeated and withdrew, covering a great distance in one night and eluding the enemy. When at dawn the latter realised that he had gone, the Numidian cavalry pursued at full speed, caught up with him and forced him to defend himself while still trying to advance so as not to be caught by the infantry. As this seriously delayed him, Gnaeus Scipio led his men onto a hill. This enabled the Romans to fend off the Numidians. However, when the Carthaginian commanders arrived, they were without entrenchments and their position was untenable. The hill was rocky; there was no wood to make a stockade, no earth for a rampart, and it was not steep enough to make the ascent difficult. The Romans tied together their saddles and the baggage