Gondor as Britain

Gondor is clearly one of Mordor's primary targets, and Gondor knows that the rising power of Mordor means they will have to sustain vicious attacks, given their proximity. Gondor also is a storied Western monarchy that was once powerful but has since weakened, much like the British Empire. This means that Denethor is Neville Chamberlain, being a leader who once had potential but has become such a useless sack of shit that he needs to be replaced during the war. It must be, then, that Aragorn is Winston Churchill - the replacement for Denethor who comes to the rescue and rallies Gondor. (Side note: We'd go so far to say that Aragorn's horse, Brego, represents whiskey, and that his sword, Narsil, represents cigars, seeing as those appear to be the two things that most aided Churchill in his life.) Continuing with Gondor as Britain, we'd say that Boromir is Field Marshal Montgomery, since he's a pretty effective soldier who happens to be an asshole. Lastly, Faramir represents King George VI - a noble man who has lived his whole life in his older brother's shadow. Lamentably, Faramir doesn't have a debilitating speech impediment. By this model, Minas Tirith is London, the Siege of Minas Tirith is the Battle of Britain, and Osgiliath is Dunkirk.