 After participating in the division of the County of Nevers-Auxerre and Tonnerre, the Chalon family was given the County of Tonnerre.As a prelude to the second phase of the Hundred Years' War, the Count of Tonnerre removed a lady-in-waiting from the court of the Duchess of Burgundy.Jean Sans Peur used this as a pretext to wage war against the Count of Tonnerre.