“The fable relates, that Perseus was dispatched from the east, by Pallas, to cut off Medusa’s head, who had committed great ravage upon the people of the west; for this Medusa was so dire a monster, as to turn into stone all those who but looked upon her. She was a Gorgon, and the only mortal one of the three, the other two being invulnerable. Perseus, therefore, preparing himself for this grand enterprise, had presents made him from three of the gods: Mercury gave him wings for his heels; Pluto, a helmet; and Pallas, a shield and a mirror. But, though he was now so well equipped, he posted not directly to Medusa, but first turned aside to the Greæ, who were half-sisters to the Gorgons. These Greæ were grayheaded, and like old women, from their birth, having among them all three but one eye, and one tooth, which, as they had occasion to go out, they each wore by turns, and laid them down again upon coming back. This eye and this tooth they lent to Perseus, who now judging himself sufficiently furnished, he, without further stop, flies swiftly away to Medusa, and finds her asleep. But not venturing his eyes, for fear she should wake, he turned his head aside, and viewed her in Pallas’s mirror, and thus directing his stroke, cut off her head; when immediately, from the gushing blood, there darted Pegasus winged. Perseus now inserted Medusa’s head into Pallas’s shield, which thence retained the faculty of astonishing and benumbing all who looked on it.” This fable seems invented to show the prudent method of choosing, undertaking, and conducting a war; and, accordingly, lays down three useful precepts about it, as if they were the precepts of Pallas. The first is, that no prince should be over-solicitous to subdue a neighboring nation; for the method of enlarging an empire is very different from that of increasing an estate. Regard is justly had to contiguity, or adjacency, in private lands and possessions; but in the extending of empire, the occasion, the facility, and advantage of a war, are to be regarded instead of vicinity. It is certain that the Romans, at the time they stretched but little beyond Liguria to the west, had by their arms subdued the provinces as far as Mount Taurus to the east. And thus Perseus readily undertook a very long expedition, even from the east to the extremities of the west. The second precept is, that the cause of the war be just and honorable; for this adds alacrity both to the soldiers, and the people who find the supplies; procures aids, alliances, and numerous other conveniences. Now there is no cause of war more just and laudable than the suppressing of tyranny; by which a people are dispirited, benumbed, or left without life and vigor, as at the sight of Medusa.