This served as an excuse for Burgundy to gather all his adherents and to march towards Paris, and as he collected the force he sent letters to all the principal towns saying that at the invitation of his son-in-law, the Duke of Aquitaine, and in consequence of the breach of the peace committed by his enemies, he was forced to take up arms to rescue his beloved daughter and the duke from the hands of those who constrained them. Upon the other hand, letters were written in the king's name to the various towns on the line by which Burgundy would advance from Artois, begging them not to open their gates to him.