Plutarch, Tiberius Gracchus
Bernadotte Perrin, Ed.

5. After this campaign he was elected quaestor, and had the fortune to serve in a war against Numantia under the consul Caius Mancinus,¹ who was not bad as a man, but most unfortunate of the Romans as a general. Therefore in the midst of unexpected misfortunes and adverse circumstances not only did the sagacity and bravery of Tiberius shine forth all the more, but also[mdash ]and this was astonishing[mdash ]the great respect and honour in which he held his commander, who, under the pressure of disasters, forgot even that he was a general. [2] For after he had been defeated in great battles, he attempted to abandon his camp and withdraw his forces by night; but the Numantines became aware of his attempt and promptly seized his camp. Then they fell upon his men as they fled, slew those who were in the rear, encompassed his whole army, and crowded them into regions that were full of difficulties and afforded no escape. Mancinus, despairing of forcing his way to safety, sent heralds to the enemy proposing a truce and terms of peace; [3] but the enemy declared that they had confidence in no Roman save only Tiberius, and ordered that he should be sent to them. They had this feeling towards the young man not only on his own account (for he was held in very high esteem by the Numantine soldiery), but also because they remembered his father Tiberius, who waged war against the Spaniards,² and subdued many of them, but made a peace with the Numantines, to the observance of which with integrity and justice he always held the Roman people. [4] So Tiberius was sent and held conference with the enemy, and after getting them to accept some conditions, and himself accepting others, effected a truce, and thereby manifestly saved the lives of twenty thousand Roman citizens, besides attendants and camp followers.