This young Tiberius, accordingly, serving in Africa under the younger Scipio, who had married his sister, and living there under the same tent with him, soon learned to estimate the noble spirit of his commander, which was so fit to inspire strong feelings of emulation in virtue and desire to prove merit in action, and in a short time he excelled all the young men of the army in obedience and courage; and he was the first that mounted the enemy's wall, as Fannius says, who writes that he himself climbed up with him, and was partaker in the achievement. He was regarded, while he continued with the army, with great affection; and left behind him on his departure a strong desire for his return.

After that expedition, being chosen paymaster, it was his fortune to serve in the war against the Numantines, under the command of Caius Mancinus, the consul, a person of no bad character, but the most unfortunate of all the Roman generals. Notwithstanding, amidst the greatest misfortunes, and in the most unsuccessful enterprises, not only the discretion and valour of Tiberius, but also, which was still more to be admired, the great respect and honour which he showed for his general, were most eminently remarkable; though the general himself, when reduced in straits, forgot his own dignity and office. For being beaten in various great battles, he endeavoured to dislodge by night and leave his camp; which the Numantines perceiving, immediately possessed themselves of his camp, and pursuing that part of the forces which was in flight, slew those that were in the rear, hedged the whole army in on every side, and forced them into difficult ground, whence there could be no possibility of an escape. Mancinus, despairing to make his way through by force, sent a messenger to desire a truce and conditions of peace. But they refused to give their confidence to any one except Tiberius, and required that he should be sent to treat with them. This was not only in regard to the young man's own character, for he had a great reputation amongst the soldiers, but also in remembrance of his father Tiberius, who, in his command against the Spaniards, had reduced great numbers of them to subjection, but granted a peace to the Numantines, and prevailed upon the Romans to keep it punctually and inviolably.

Tiberius was accordingly despatched to the enemy, whom he persuaded to accept of several conditions, and he himself complied with others; and by this means, it is beyond a question, that he saved twenty thousand of the Roman citizens, besides attendants and camp followers. However, the Numantines retained possession of all the property they had found and plundered in the encampment; and amongst other things were Tiberius's books of accounts, containing the whole transactions of his quaestorship, which he was extremely anxious to recover. And therefore, when the army were already upon their march, he returned to Numantia, accompanied with only three or four of his friends; and making his application to the officers of the Numantines, he entreated that they would return him his books, lest his enemies should have it in their power to reproach him with not being able to give an account of the moneys intrusted to him. The Numantines joyfully embraced this opportunity of obliging him, and invited him into the city; as he stood hesitating, they came up and took him by the hands, and begged that he would no longer look upon them as enemies, but believe them to be his friends, and treat them as such. Tiberius thought it well to consent, desirous as he was to have his books returned, and was afraid lest he should disoblige them by showing any distrust. As soon as he entered into the city, they first offered him food, and made every kind of entreaty that he would sit down and eat something in their company. Afterwards they returned his books, and gave him the liberty to take whatever he wished for in the remaining spoils. He, on the other hand, would accept of nothing but some frankincense, which he used in his public sacrifices, and bidding them farewell with every expression of kindness, departed.

When he returned to Rome, he found the whole transaction censured and reproached, as a proceeding that was base and scandalous to the Romans. But the relations and friends of the soldiers, forming a large body among the people, came flocking to Tiberius, whom they acknowledged as the preserver of so many citizens, imputing to the general all the miscarriages which had happened. Those who cried out against what had been done, urged for imitation the example of their ancestors, who stripped and handed over to the Samnites not only the generals who had consented to the terms of release, but also all the quaestors, for example, and tribunes, who had in any way implicated themselves in the agreement, laying the guilt of perjury and breach of conditions on their heads. But, in this all the populace, showing an extraordinary kindness and affection for Tiberius, indeed voted that the consul should be stripped and put in irons, and so delivered to the Numantines; but, for the sake of Tiberius, spared all the other officers. It may be probable, also, that Scipio, who at that time was the greatest and most powerful man among the Romans, contributed to save him, though indeed he was also censured for not protecting Mancinus too, and that he did not exert himself to maintain the observance of the articles of peace which had been agreed upon by his kinsman and friend Tiberius. But it may be presumed that the difference between them was for the most part due to ambitious feelings, and to the friends and reasoners who urged on Tiberius, and, as it was, it never amounted to anything that might not have been remedied, or that was really bad. Nor can I think that Tiberius would ever have met with his misfortunes, if Scipio had been concerned in dealing with his measures; but he was away fighting at Numantia when Tiberius, upon the following occasion, first came forward as a legislator.