The Florentines, being entirely without arms, sent ten thousand Frenchmen to take Pisa, whereby they ran more danger than at any other time of their troubles.
The Emperor of Constantinople,(*) to oppose his neighbours, sent ten thousand Turks into Greece, who, on the war being finished, were not willing to quit; this was the beginning of the servitude of Greece to the infidels.
(*) Joannes Cantacuzenus, born 1300, died 1383.
Therefore, let him who has no desire to conquer make use of these arms, for they are much more hazardous than mercenaries, because with them the ruin is ready made; they are all united, all yield obedience to others; but with mercenaries, when they have conquered, more time and better opportunities are needed to injure you; they are not all of one community, they are found and paid by you, and a third party, which you have made their head, is not able all at once to assume enough authority to injure you. In conclusion, in mercenaries dastardy is most dangerous; in auxiliaries, valour. The wise prince, therefore, has always avoided these arms and turned to his own; and has been willing rather to lose with them than to conquer with the others, not deeming that a real victory which is gained with the arms of others.
I shall never hesitate to cite Cesare Borgia and his actions. 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.