You have already been sufficiently informed of the motives of this war, and that the two princes were at first deluded, and invaded one another without understanding the true grounds of the quarrel; which is a convincing argument of the marvellous subtilty of those that managed that affair, and confirms the old saying, That one half of the world does not know what the other is doing. But all these passages which I have mentioned happened in a very little space of time; for, in less than a fortnight after the taking of Amiens, the Duke of Burgundy took the field near Arras (for he retired no farther), and marched afterwards towards the Somme, directly to Picquigny. As he was upon his march, a messenger (no better than a footman) came to him from the Duke of Bretagne, who told him from his master, that the king had acquainted him with much of his affairs, and among the rest, that he had considerable parties in several of his great towns, naming Antwerp, Bruges and Brussels: he gave him notice, also, that the king designed to besiege him wherever he should find him, though it were in Ghent itself. I am of opinion that this message was intended only in favour of the Duke of Guienne, and to further the match. But the Duke of Burgundy was highly displeased at this information, and told the messenger immediately, that his master was misinformed, and that it was only some bad courtiers about him who had filled his imagination with those jealousies and apprehensions, solely with a design to deprive him of the supplies which by his alliance he was obliged to send him; and that as to the town of Ghent, and the rest which he mentioned, he was misinformed, for they were too large to be besieged; that he should undeceive his master, letting him know how he found him attended, and that he was now marching to pass the River Somme, and was resolved to fight the King of France, if he endeavoured to interrupt the course of his arms. He desired him, therefore, that he would entreat the duke his master, from him, to declare himself immediately against the king, and that he would show himself no otherwise to the Duke of Burgundy than the Duke of Burgundy had expressed himself towards him in the treaty of Peronne.