Therefore, he who considers both of these states will recognize great difficulties in seizing the state of the Turk, but, once it is conquered, great ease in holding it.

The causes of the difficulties in seizing the kingdom of the Turk are that the usurper cannot be called in by the princes of the kingdom, nor can he hope to be assisted in his designs by the revolt of those whom the lord has around him.

This arises from the reasons given above; for his ministers, being all slaves and bondmen, can only be corrupted with great difficulty, and one can expect little advantage from them when they have been corrupted, as they cannot carry the people with them, for the reasons assigned.
Hence, he who attacks the Turk must bear in mind that he will find him united, and he will have to rely more on his own strength than on the revolt of others; but, if once the Turk has been conquered, and routed in the field in such a way that he cannot replace his armies, there is nothing to fear but the family of this prince, and, this being exterminated, there remains no one to fear, the others having no credit with the people; and as the conqueror did not rely on them before his victory, so he ought not to fear them after it.
The contrary happens in kingdoms governed like that of France, because one can easily enter there by gaining over some baron of the kingdom, for one always finds malcontents and such as desire a change.

Such men, for the reasons given, can open the way into the state and render the victory easy; but if you wish to hold it afterwards, you meet with infinite difficulties, both from those who have assisted you and from those you have crushed.

Nor is it enough for you to have exterminated the family of the prince, because the lords that remain make themselves the heads of fresh movements against you, and as you are unable either to satisfy or exterminate them, that state is lost whenever time brings the opportunity.
Now if you will consider what was the nature of the government of Darius, you will find it similar to the kingdom of the Turk, and therefore it was only necessary for Alexander, first to overthrow him in the field, and then to take the country from him.