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Adalgisel and Grimoald led the Austrasian army against the Thuringii sometime around 639, but their magnates defected and they were forced to concentrate on protecting the young king's life. His forces were subsequently defeated by Duke Radulf. Not long after, he ceased to be duke and was replaced by Pepin of Landen, probably following the nearly concurrent death of Dagobert. Though he lost his office, there is no evidence that he died at that time and some charters referring to a person of the same name may refer to him, thus indicating his survival long after the fact.