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In page Dover:

"

Louis VIII of France landed his army, seeking to depose King Henry III, on Dover's mainland beach. Henry III ambushed Louis' army with approximately 400 bowmen atop The White Cliffs of Dover and his cavalry attacking the invaders on the beach. However, the French slaughtered the English cavalry and made their way up the cliffs to disperse the bowmen. Louis' army seized Dover village, forcing the English back to Canterbury. French control of Dover lasted for three months after which English troops pushed back, forcing the French to surrender and return home.[citation needed]