LXXVI.--Petreius, after accomplishing this, went round every maniple, calling the soldiers by their names and entreating with tears, that they would not give up him and their absent general Pompey, as a sacrifice to the vengeance of their enemies. Immediately they ran in crowds to the general's pavilion, when he required them all to take an oath that they would not desert nor betray the army nor the generals, nor form any design distinct from the general interest. He himself swore first to the tenor of those words, and obliged Afranius to take the same oath. The tribunes and centurions followed their example; the soldiers were brought out by centuries, and took the same oath. They gave orders, that whoever had any of Caesar's soldiers should produce them; as soon as they were produced, they put them to death publicly in the praetorium, but most of them concealed those that they had entertained, and let them out at night over the rampart. Thus the terror raised by the generals, the cruelty of the punishments, the new obligation of an oath, removed all hopes of surrender for the present, changed the soldiers' minds, and reduced matters to the former state of war. LXXVII.--Caesar ordered the enemy's soldiers, who had come into his camp to hold a conference, to be searched for with the strictest diligence, and sent back. But of the tribunes and centurions, several voluntarily remained with him, and he afterwards treated them with great respect. The centurions he promoted to higher ranks, and conferred on the Roman knights the honour of tribunes. LXXVIII.--Afranius's men were distressed in foraging, and procured water with difficulty. The legionary soldiers had a tolerable supply of corn, because they had been ordered to bring from Ilerda sufficient to last twenty-two days; the Spanish and auxiliary forces had none, for they had but few opportunities of procuring any, and their bodies were not accustomed to bear burdens; and therefore a great number of them came over to Caesar every day. Their affairs were under these difficulties; but of the two schemes proposed, the most expedient seemed to be to return to Ilerda, because they had left some corn there; and there they hoped to decide on a plan for their future conduct. Tarraco lay at a greater distance; and in such a space they knew affairs might admit of many changes. Their design having met with approbation, they set out from their camp. Caesar having sent forward his cavalry, to annoy and retard their rear, followed close after with his legions. Not a moment passed in which their rear was not engaged with our horse.