Edward III Claims the French Throne and…

1340 CE

Edward III Claims the French Throne and the Battle of Sluys (1340): The War Escalates

Following the confiscation of Aquitaine by Philip VI in 1337, Edward III of England escalated the conflict by reviving his claim to the French throne, setting the stage for full-scale war. His diplomatic maneuvers in Flanders and his decisive naval victory at the Battle of Sluys (1340) established England’s dominance at sea, securing its strategic position for the early phases of the Hundred Years’ War (1337–1453).

Edward III’s Claim to the French Throne (1340)

When Charles IV of France died in 1328, Edward had initially claimed the French throne through his mother, Isabella, Charles’s sister and daughter of Philip IV.
However, his 1329 homage to Philip VI as Duke of Aquitaine had weakened his claim—accepting Philip as his liege lord implied recognition of his legitimacy as king.
In 1340, Edward revoked his homage and formally assumed the title "King of France," adopting the French royal arms.

The Importance of Flanders and the Low Countries

On January 26, 1340, Edward received homage from Guy of Flanders, half-brother of the Count of Flanders.
The civic authorities of Ghent, Ypres, and Bruges proclaimed Edward King of France, a move that strengthened his alliance with the wealthy Flemish cities.
This was crucial, as Flanders was heavily reliant on English wool imports to sustain its textile industry.
By asserting himself as the "true" King of France, Edward’s Flemish allies could claim they were not rebels against Philip VI but were instead loyal subjects of the rightful king.

Economic Motivations and the Importance of the Wool Trade

England’s wool exports to Flanders were a major economic driver, generating large revenues for the crown through taxation.
Edward emphasized its importance by commanding that his chancellor sit on the woolsack in council, symbolizing wool’s economic preeminence.
French naval power disrupted England’s trade, restricting the flow of wool to Flanders and wine from Gascony, further escalating hostilities.

The Battle of Sluys (June 24, 1340): England Secures Naval Dominance

On June 22, 1340, Edward set sail with 150 ships and 40,000 men, arriving the next day at the Zwijn estuary, near Bruges.
The French fleet, commanded by Admiral Hugues Quiéret and Nicolas Béhuchet, had taken up a defensive position near Sluys, chaining their ships together to form a floating fortress.
Initially, the French believed the English were retreating, but when the wind turned in the late afternoon, Edward ordered an attack with the wind and sun at his back, giving the English a strategic advantage.
The battle resulted in a catastrophic defeat for France:
- Nearly the entire French fleet was destroyed.
- Thousands of French sailors were killed or captured.
- Admiral Béhuchet was executed, while Quiéret was slain in battle.

Consequences of Sluys: England Controls the English Channel

The English navy’s victory secured control over the Channel, preventing French invasions of England for the rest of the war.
The destruction of the French fleet severely weakened France’s ability to project naval power, forcing it to rely on land campaigns.
The battle proved that naval dominance was key to England’s long-term strategy in the Hundred Years’ War.

Conclusion

Edward’s claim to the French throne in 1340 and his alliances in Flanders escalated the war, transforming it from a territorial dispute into a dynastic struggle.
The Battle of Sluys (June 1340) secured English naval supremacy, allowing Edward to dictate the course of future campaigns.
Despite Edward’s military success, financial pressures forced him to return to England in February 1340, highlighting the economic challenges of sustained warfare.

The Battle of Sluys marked England’s dominance at sea, ensuring that France would struggle to match England’s naval power for decades, shaping the course of the Hundred Years’ War.