The siege of Guînes took place from May to July 1352 when a French army under Geoffrey de Charny unsuccessfully attempted to recapture the French castle at Guînes which had been seized by the English the previous January. The siege was part of the Hundred Years' War and took place during the uneasy and ill-kept truce of Calais.

Source: https://en.wikipedia.org/wiki/Siege_of_Gu%C3%AEnes_(1352)

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