Plutarch, Aemilius Paulus
Bernadotte Perrin, Ed.

13. For he not only sent away the Gauls after playing them false, but also, after inducing Genthius the Illyrian, on payment of three hundred talents, to assist him in the war, he showed to the king's messengers the money all counted out, and suffered them to put their seals upon the bags; then, when Genthius, convinced that he had the price he had asked, committed a dreadful and impious deed, arresting and imprisoning a Roman embassy that had been sent to him, [2] Perseus, thinking that the money was no longer needed to make Genthius an enemy of Rome, since before getting it he had given a lasting earnest of his hatred and had involved himself in the war by the great wrong which he had done, deprived the poor wretch of the three hundred talents, and suffered him in a little while to be taken from his kingdom with his wife and children, as birds from their nest, by Lucius Anicius, a general sent against him with an army.

[3] Aemilius, coming against such an adversary, scorned him indeed, but admired his preparations and his army. For Perseus had four thousand horsemen, and not much fewer than forty thousand heavy-armed footmen. And planting himself with the sea behind him, along the foot-hills of Mount Olympus, on ground which nowhere afforded an approach, and which had been fortified on all sides by him with bulwarks and outworks of wood, he lay in great security, thinking that by delay and expense he would wear out Aemilius. [4] But Aemilius was a man who clung to his purpose, and tested every plan and method of attack; seeing, however, that his army, by reason of their former license, was impatient of delay, and inclined to dictate to their general many impracticable things, he rebuked them, and instructed them to take no thought or concern for anything, except how each man might keep himself and his armour in readiness for action, and ply his sword in Roman fashion, when their general gave them the opportunity. [5] Furthermore, he ordered the night watchmen to keep watch without their spears, with the idea that they would be more on the alert and would struggle more successfully against sleep, if they were unable to defend themselves against their enemies when they approached.