 But the threat of an attack by Castile forced Charles to remain in Navarre.Instead he sent off his eldest son to Normandy, with a number of officials, including his chamberlain Jacques de Rue, who were to prepare his castles to receive the English, as well as a servant whose mission was to insinuate himself into the royal kitchens in Paris and poison the King of France.Meanwhile he urgently appealed for the English to send him reinforcements from Gascony to help him fight the Castilians.