1340: Maritime Stakes and the Battle of the Sluys

War demands control of the seas: supply, troop transport, commerce protection. In 1340, the naval battle of the Sluys (near Bruges) becomes a turning point: France loses the initiative at sea to England.

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⚓ Why the Sea Matters

Without maritime mastery, it is difficult to defend coasts, support allies, and conduct operations in Flanders or Guyenne. The English Channel is also a vital commercial artery.

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🧠 A Strategic Shift

French naval defeat weakens the capacity to prevent landings and control the northern facade. War globalizes in some sense: it touches sea, ports, and merchant circuits.

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🧠 Key Points to Remember

• 1340: sea becomes a decisive theater.
• Loss of naval initiative favors English operations.