 The next year, on 20 June, he claimed an even more famous victory at the Battle of La Roche-Derrien, where he captured Charles of Blois.He was summoned to the Parliament of England in 1347 as Baron Dagworth.He was killed in an ambush on 20 July 1350, near Auray, a few miles west of Vannes, by a Breton force under Raoul de Caours.