How did Louis XI regain Normandy in 1466?

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Following the settlement of October 1465, which had forced Louis XI to cede Normandy to his brother, Charles de France, the king worked tirelessly to undo the treaty. In 1466, Louis XI successfully regained control of the region by actively fomenting strife between Normandy and Brittany, a strategy that allowed him to recover the territory while simultaneously isolating his rivals.123