I cordially dislike allegory in all its manifestations, and always have done so since I grew old and wary enough to detect its presence. I much prefer history – true or feigned– with its varied applicability to the thought and experience of readers. I think that many confuse applicability with allegory, but the one resides in the freedom of the reader, and the other in the purposed domination of the author.

-J.R.R. Tolkien

I know this doesn't answer the meat of your question, but Tolkien long maintained that his works were not allegorical, they were pure fantasy. If such an event as you described did occur, it wasn't represented in The Return of the King.