Titus Livius (Livy), The History of Rome, Book 5
Benjamin Oliver Foster, Ph.D., Ed.

45. Well-wishers and opponents were alike persuaded that there was no such warrior in those days anywhere. Breaking up the council, they supped, and waited intently for the signal. On its being given, in the silence of the early night, they presented themselves before Camillus at the gates. [2] They had not left the city very far behind them, when they came to the camp of the Gauls, unguarded, just as he had prophesied, and open on every side, and, giving a loud cheer, rushed upon it. [3] There was no resistance anywhere: the whole place was a shambles, where unarmed men, relaxed in sleep, were slaughtered. Those, however, who were farthest off were frightened from the places where they lay, and ignorant of the nature of the attack or its source, fled panic-stricken, and some ran unawares straight into the enemy. The most of them were carried into the territory of Antium, where they wandered about until the townspeople sallied out and cut them off.

[4] A similar overthrow was experienced, in the region of Veii, by the Etruscans. So far were they from [p. 153]pitying a City that had been their neighbour for¹ close upon four hundred years, and was now overwhelmed by an enemy never seen or heard of before, that they chose that time to make incursions into the lands of the Romans; and laden with spoils, even meditated an attack on Veii and its garrison, the last hope of the Roman name. [5] The Roman soldiers had seen them, as they ranged through the fields and afterwards, gathering in a body, drove the booty off before them, and could descry their camp, which was pitched not far from Veii. [6] This made them at first to compassionate themselves; then they were seized with resentment, which soon gave way to rage: were even the Etruscans, whom they had saved from the Gauls by incurring war themselves, to make sport of their calamities? [7] They could hardly curb an impulse to assail them on the instant; but being restrained by the centurion Quintus Caedicius, whom they had chosen to be their commander, they postponed the affair till dark. [8] The only thing wanting was a leader like Camillus; in all else the order followed was the same, and the same success was achieved. Indeed, under the guidance of captives who had survived the nocturnal massacre, they set out on the following night and came to another band of Etruscans, at the salt-works,² whom they surprised and defeated with even greater carnage; and so, rejoicing in their double victory, returned to Veii.