This duke entered the Romagna with auxiliaries, taking there only French soldiers, and with them he captured Imola and Forli; but afterwards, such forces not appearing to him reliable, he turned to mercenaries, discerning less danger in them, and enlisted the Orsini and Vitelli; whom presently, on handling and finding them doubtful, unfaithful, and dangerous, he destroyed and turned to his own men.

And the difference between one and the other of these forces can easily be seen when one considers the difference there was in the reputation of the duke, when he had the French, when he had the Orsini and Vitelli, and when he relied on his own soldiers, on whose fidelity he could always count and found it ever increasing; he was never esteemed more highly than when every one saw that he was complete master of his own forces.
I was not intending to go beyond Italian and recent examples, but I am unwilling to leave out Hiero, the Syracusan, he being one of those I have named above.

This man, as I have said, made head of the army by the Syracusans, soon found out that a mercenary soldiery, constituted like our Italian condottieri, was of no use; and it appearing to him that he could neither keep them not let them go, he had them all cut to pieces, and afterwards made war with his own forces and not with aliens.
I wish also to recall to memory an instance from the Old Testament applicable to this subject.

David offered himself to Saul to fight with Goliath, the Philistine champion, and, to give him courage, Saul armed him with his own weapons; which David rejected as soon as he had them on his back, saying he could make no use of them, and that he wished to meet the enemy with his sling and his knife.

In conclusion, the arms of others either fall from your back, or they weigh you down, or they bind you fast.
Charles the Seventh,( *) the father of King Louis the Eleventh,( +) having by good fortune and valour liberated France from the English, recognized the necessity of being armed with forces of his own, and he established in his kingdom ordinances concerning men-at-arms and infantry.
Afterwards his son, King Louis, abolished the infantry and began to enlist the Switzers, which mistake, followed by others, is, as is now seen, a source of peril to that kingdom; because, having raised the reputation of the Switzers, he has entirely diminished the value of his own arms, for he has destroyed the infantry altogether; and his men-at-arms he has subordinated to others, for, being as they are so accustomed to fight along with Switzers, it does not appear that they can now conquer without them.