Henry III's army was camped at Grosmont Castle when they were attacked in the night by a force of Welsh and English rebels. Several of Henry's supporters were captured and the castle was returned to Hubert de Burgh, one of the rebels.1
English forces fought and defeated Welsh forces in two battles at Grosmont and Usk. Sir John Talbot defeated Glendower at Grosmont and Prince Henry forced the Welsh to flee at Usk. Glendower's eldest son was captured at Usk and sent to the Tower of London where he died.
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