How The Lord of the Rings: The War of the Rohirrim adapts two pages of Tolkien lore into a whole movie

The Lord of the Rings: The War of the Rohirrim is a fascinating experiment in adaptation. It's not adapting a novel of J.R.R. Tolkien's, but rather two pages from his Appendices, which lay out the last great stand of one of Rohan's most famed kings, Helm Hammerhand (voiced by Succession's Brian Cox).

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In this section of the Appendices...