Assertion: henry's defeat | /r/HasProperty | notable
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text: Henry helped William (the future William I of England), Robert’s successor as duke of Normandy, to quell his rebellious vassals at the Battle of Val-aux-Dunes (or Val-ès-Dunes; 1047), but he was thereafter usually at war with him—a notable defeat for the king being that at Varaville (1058).