Titus Livius (Livy), The History of Rome, Book 5
Rev. Canon Roberts, Ed.

47. While¹ these proceedings were taking place at Veii, the Citadel and Capitol of Rome were in imminent [2] danger. The Gauls had either noticed the footprints left by the messenger from Veii, or had themselves discovered a comparatively easy ascent up the cliff to the temple of Carmentis. Choosing a night when there was a faint glimmer of light, they sent an unarmed man in advance to try the road; then handing one another their arms where the path was difficult, and supporting each other or dragging each other up as the ground required, they finally reached the [3] summit. So silent had their movements been that not only were they unnoticed by the sentinels, but they did not even wake the dogs, an animal peculiarly sensitive to nocturnal [4] sounds. But they did not escape the notice of the geese, which were sacred to Juno and had been left untouched in spite of the extremely scanty supply of food. This proved the safety of the garrison, for their clamour and the noise of their wings aroused M. Manlius, the distinguished soldier, who had been consul three years before. He snatched up his weapons and ran to call the rest to arms, and while the rest hung back he struck with the boss of his shield a Gaul who had got a foothold on the summit and knocked him [5] down. He fell on those behind and upset them, and Manlius slew others who had laid aside their weapons and were clinging to the rocks with their hands. By this time others had joined him, and they began to dislodge the enemy with volleys of stones and javelins till the whole body fell helplessly down to the [6] bottom. When the uproar had died away, the remainder of the night was given to sleep, as far as was possible under such disturbing circumstances, whilst their peril, though past, still made them [7] anxious.

At daybreak the soldiers were summoned by sound of trumpet to a council in the presence of the tribunes, when the due rewards for good conduct and for bad would be [8] awarded. First, Manlius was commended for his bravery, and rewarded not by the tribunes alone but by the soldiers as a body, for every man brought to him at his quarters, which were in the Citadel, half a pound of meal and a quarter of a pint of wine. This does not sound much, but the scarcity made it an overwhelming proof of the affection felt for him, since each stinted himself of food and contributed in honour of that one man what had to be taken from his necessaries of [9] life. Next, the sentinels who had been on duty at the spot where the enemy had climbed up without their noticing it were called forward. Q. Sulpicius, the consular tribune, declared that he should punish them all by martial [10] law. He was, however, deterred from this course by the shouts of the soldiers, who all agreed in throwing the blame upon one man. As there was no doubt of his guilt, he was amidst general approval flung from the top of the [11] cliff.

A stricter watch was now kept on both sides; by the Gauls because it had become known that messengers were passing between Rome and Veii; by the Romans, who had not forgotten the danger they were in that night.