Question: What did the Anglo-Saxons fail to prevent during the battle which inspired the J.R.R. Tolkien work The Homecoming of Beorhtnoth Beorhthelm's Son?
Sentence (from "The Homecoming of Beorhtnoth Beorhthelm's Son"): The work was accompanied by two essays, also by Tolkien, one before and one after the main work.
Relevant evidence: No