The Florentines, having no army of their own, asnd wishing to get possession of Pisa, employed for that purpose ten thousand French troops, and were involved in greater danger by them than they had ever experienced from any other difficulty. The Emperor of Constantinople, by way of resisting the attacks of his neighbors, put ten thousand troops into Greece, who at the termination of the war refused to leave the country again; and this was the beginning of the subjection of Greece to the infidels.
Whoever, then, desires not to be victorious, let him employ auxiliary troops, for they are much more dangerous even than mercenaries. For your ruin is certain with auxiliaries, who are all united in their obedience to another; whilst mercenaries, even after victory, need more time and greater opportunity to injure you, for they are not one homogeneous body, and have been selected by yourself and are in your pay, and their commander being appointed by you, he cannot so quickly gain sufficient influence over these troops to enable him to injure you. In short, with mercenaries the danger lies in their cowardice and bad faith; whilst with auxiliaries their valor constitutes the danger.
A wise prince, therefore, should ever avoid employing either one of them, and should rely exclusively upon his own troops, and should prefer defeat with them rather than victory with the troops of others, with whom no real victory can ever be won. In proof of this, I shall not hesitate again to cite the conduct of Cesar Borgia. This Duke entered the Romagna with auxiliaries, taking there only French troops, with whom he took Imola and Furli. But thinking afterwards that these troops were not reliable, he had recourse to mercenaries, whom he deemed less dangerous, and engaged the Orsini and the Vitelli. These, however, proved themselves by their conduct to be uncertain, faithless, and dangerous; and therefore the Duke destroyed them, and then relied upon his own troops exclusively. The difference between the one and the other of these troops is easily seen when we look at the reputation of the Duke Valentino at the time when he employed the Orsini and the Vitelli, and when he had none but his own troops; for then his credit increased steadily, and the Duke was never more highly esteemed than when every one saw that he was thoroughly master of his armies.
