BattlefieldsWelsh Capture of Beaumaris Castle 1403 temporarily
Medieval

Welsh Capture of Beaumaris Castle 1403 temporarily

1403
Anglesey, Wales
Also known as: Glyndwr forces briefly occupy Beaumaris outskirts 1403
Era
Medieval
Battle Type
Skirmish
Location
Anglesey, Wales
Status
Unregistered
The Combatants

Who Fought

Defeated
Welsh rebels
Forces
English garrison c.200–300; Anglesey dominated by rebels, castle resisted.
VS
Victor
England (garrison holds)
Forces
Welsh c.1,500–2,500
Outcome
Welsh forces control most of Anglesey and besiege Beaumaris; outer works threatened; castle holds
The Battle

History & Significance

By 1403 Glyndwr's forces controlled virtually all of Anglesey except Beaumaris Castle. The Welsh occupied the island, cutting off supplies to the castle, but could not breach its concentric defences. Beaumaris was Edward I's final masterpiece of castle design and proved impregnable without siege artillery. The Welsh control of Anglesey was strategically crucial as it denied England the island's grain supply and maintained pressure on Caernarfon. The castle eventually resisted throughout the rebellion.

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