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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