I Spent 12 Hours Studying Edward III’s Breton Campaign — Here’s What Shocked Me

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In 1342, while Europe was engulfed in the early flames of the Hundred Years’ War, King Edward III of England launched a daring but little-known campaign in Brittany — a civil war within a war. This wasn’t just a side quest; it was a masterclass in medieval strategy that shifted the balance of power.

The War of the Breton Succession

The conflict arose from a dispute over the succession to the Duchy of Brittany. Edward III backed John of Montfort, while the French crown supported Charles of Blois. This proxy war turned Brittany into a bloody chessboard where the future of France and England would be contested.

The Battle of Morlaix: A Tactical Masterpiece

One of the campaign’s highlights was the Battle of Morlaix. Despite facing overwhelming odds, English forces utilized terrain and longbow tactics that would later become famous at battles like Crécy. The English victory here proved that their military doctrine was superior to the traditional French cavalry charge.

Why This Matters

• The Siege of Brest: This campaign established Brest as a crucial English naval stronghold for decades, securing a landing point for future invasions.
• Jeanne la Flamme: The fierce Joanna of Flanders played a pivotal role, leading troops and defending fortresses, earning her the nickname “Fiery Joanna.”

The Astonishing Truce of Malestroit

The campaign concluded with the Truce of Malestroit, a peace deal that historians describe as “astonishingly favorable to England.” Edward III, despite logistical nightmares and a massive opposing army, managed to secure terms that legitimized his intervention and solidified English footholds in France.

Source: Wikipedia (War of the Breton Succession, Edward III, Battle of Morlaix)