V. After that expedition he was elected quæstor,[39] and it fell to his lot to serve in that capacity under the consul Caius Mancinus,[40] no bad man, but the most unlucky of Roman generals. Accordingly in adverse fortune and critical affairs the prudence and courage of Tiberius became the more conspicuous, and not only his prudence and courage, but what was truly admirable, his consideration and respect for his general, whose reverses almost made him forget who he was. Having been defeated in several great battles, Mancinus attempted to leave his camp by night and make a retreat. The Numantines, however, perceived his movements, and immediately seizing the camp, fell on the Romans in their flight and killed those in the rear; and at last, when they were surrounding the whole army and driving them to unfavourable ground, from which escape was impossible, Mancinus, despairing of all chance of saving himself by resistance, sent to treat for a truce and terms of peace. But the Numantines declared that they would trust nobody except Tiberius, and they bade Mancinus send him. The Numantines had come to this resolution as well from a knowledge of the young man's character, for there was much talk about him in this campaign, as from the remembrance of his father Tiberius, who, after carrying on war against the Iberians and subduing many of them, made peace with the Numantines, and always kept the Roman people to a fair and just observance of it. Accordingly Tiberius was sent, and had a conference with the Numantines, in which he got some favourable conditions, and, by making some concessions, obtained a truce, and thus saved twenty thousand Roman citizens, besides the slaves and camp-followers.