The Siege of Hennebont occurred during the War of the Breton Succession. The forces of Charles of Blois conducted an unsuccessful siege of Jeanne of Flandre's troops in May-June 1342.

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Siege of Hennebont (1342)
Part of the Breton War of Succession
Siege of Hennebont.
Date May–June 1342 Location Hennebont, Duchy of Bretagne
Belligerents
House of Montfort, Brittany Kingdom of England	House of Blois, Brittany Kingdom of France

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Jeanne of Flandre took refuge in Hennebont and waited for reinforcements promised by her vassal, Amaury of Clisson and English troops. The city was besieged by the supporters of the opposing ducal claimant, Charles of Blois. When Charles' army arrived in front of the city, some of his Spanish and Genoese troops advanced against orders and engaged some of the defenders in impromptu tournaments in front of the city gates. Charles was forced to assault the town gates prematurely to allow his impetuous troops to retreat, but the attack failed and the defenders inflicted heavy losses on his army. Subsequent assaults also failed and the besiegers attempted to starve the defenders out for several weeks before lifting the siege in late June.^[1]