The Normandy campaign, royal imprisonment (1355-1357). Towards July 1355, Charles II set out to lead the Normandy campaign, his possession threatened by the French. 2,000 Navarrese embarked in Bayonne and other points on the Basque coast landed in Cherbourg (August) consolidating the Norman strongholds that had not fallen into French hands. But the French king managed to seize Charles (5 April 1356), this time by means of a ruse ("invited to dinner", says the Prince of Viana) and imprisoned him first in the Louvre prison, and then in the castle of Arleux-le-Palluel. Nevertheless, John II's affairs were going from bad to worse; Once the ties with England were broken, the latter was defeated at Poitiers (17 September 1356) by the Black Prince and taken to London. In his place was the Dauphin Charles, with whom the Navarrese also had no understanding, despite initial appearances. The bourgeoisie of Paris revolted (14 January 1357), demanding the release of Charles, the regular convocation of the Estates, etc. It was a parliamentary and urban revolution (in this case Parisian). The freedom of Charles was decreed in March 1357, according to a document reproduced by Yanguas, but it must not have been put into effect, since on the night of 8 to 9 November of this year, a group of Navarrese nobles - among them Jacques de la Rue - and bourgeois of Amiens, disguised as charcoal burners, managed to free the monarch. "He then negotiated, without a doubt," says Campi n, "a treaty with Edward II of England by which he obtained the restitution of Champagne and Brie and suspended the restitution of the Duchy of Normandy, the bailiwick of Amiens and the county of Chartres, until both sovereigns came to an agreement." The Dauphin assigned Don Carlos 10,000 pounds in the seneschalship of Toulouse and county of Bigorre as compensation for the 18 months of confinement.