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In page John II of France:

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This act, which was largely driven by revenge for Charles of Navarre's and John of Harcourt's pre-meditated plot that killed John's favourite, Charles de La Cerda, would push much of what remaining support the King had from the lords in Normandy away to King Edward and the English camp, setting the stage for the English invasion and the resulting Battle of Poitiers in the months to come.[citation needed]