Sertorius

Here the soldiers shook off all discipline in the midst of plenty, and were drunk most of the time, so that the Barbarians came to despise them, and one night sent for aid from their neighbours, the Oritanians, and falling upon the Romans in their quarters began to kill them. But Sertorius with a few others slipped out, and assembled the soldiers who were making their escape, and surrounded the city. He found the gate open by which the Barbarians had stolen in, but did not repeat their mistake; instead, he set a guard there, and then, taking possession of all quarters of the city, slew all the men who were of age to bear arms.

Then, when the slaughter was ended, he ordered all his soldiers to lay aside their own armour and clothing, to array themselves in those of the Barbarians, and then to follow him to the city from which the men came who had fallen upon them in the night. Having thus deceived the Barbarians by means of the armour which they saw, he found the gate of the city open, and caught a multitude of men who supposed they were coming forth to meet a successful party of friends and fellow citizens. Therefore most of the inhabitants were slaughtered by the Romans at the gate; the rest surrendered and were sold into slavery.