They had various allies at court, and believed that they should be able to overthrow the minister who had so long ruled over France in the name of the king.
As Hector was now able to move about, and was acquainted with all the members of the duke's household, he learned much of what was going on; and from a conversation that he accidentally overheard, he could see that the position was an extremely serious one, as a treaty had been signed with Ferdinand, son of the King of Spain, and the Archduke Leopold-William, son of the Emperor of Austria, by which each agreed to assist the duke and his friends with a large sum of money for raising soldiers, and with seven thousand men.

In order to justify themselves, the heads of the movement issued a manifesto, in which they styled themselves Princes of Peace.

In this they rehearsed the cardinal's various acts of tyranny and cruelty towards his rivals, the arbitrary manner in which he carried on the government, and declared that they were leagued solely to overthrow the power that overshadowed that of the king, plunged France into wars, and scourged the people with heavy taxation.
As soon as this manifesto was published in Sedan, Hector went to the duke.
"My lord duke," he said, "I cannot sufficiently thank you for the hospitality and kindness with which you and the duchess have treated me.
Nevertheless, I must ask you to allow me to leave at once." "Why this sudden determination, Captain Campbell ?" "If, sir, I were but a private person I should have no hesitation, after the kindness that you have shown me, in requesting you to give me employment in the force that you are raising; but I am an officer of the king, and what is of far greater importance at the present moment, an aide-de-camp of the Viscount Turenne, your brother.

Were it reported that I was with your army, or even indeed that I was here, the cardinal would at once conclude that I was representing the viscount, and was perhaps the intermediary through whom communications between you and your brother were being carried on.

Therefore I should not only compromise myself, which is of no importance, but I might excite suspicion in Richelieu's mind against your brother, which might result in his recall from the position in which he has so distinguished himself, and grievously injure his prospects.