Question: Which 991 CE battle beside River Blackwater is the inspiration for an Old English poem of the same name?
{'answer': 'Battle of Maldon', 'supporting_facts': [["The Homecoming of Beorhtnoth Beorhthelm's Son", 1], ["The Homecoming of Beorhtnoth Beorhthelm's Son", 2], ['Battle of Maldon', 0]]}