In 'The Choices of Master Samwise', when Sam believes Frodo to be dead, his anguish leads him to contemplate his own death, by suicide:
He looked on the bright point of the sword. He thought of the places behind where there was a black brink and an empty fall into nothingness. There was no escape that way. That was to do nothing, not even to grieve.
(TT 4.x.732)
When the orcs arrive in the pass and discover Frodo's dead body (as Sam still believes), Sam again imagines his own death:
How many can I kill before they get me? They’ll see the flame of the sword, as soon as I draw it, and they’ll get me sooner or later. I wonder if any song will ever mention it: How Samwise fell in the High Pass and made a wall of bodies round his master. No, no song. Of course not, for the Ring’ll be found, and there’ll be no more songs.
(TT 4.x.735)
In these moments one of the Great Tales of the First Age resonates within Sam's soul. Unlike the many explicit evocations of the Tale of Beren and Lúthien in The Lord of the Rings, the allusions here are far more obscure, to the Tale of the Children of Húrin, where Túrin fell upon his sword, where his sister, Nienor, leaped to her death; and where their father, Húrin, made the heroic last stand to end all heroic last stands. To catch these allusions, however, requires detailed knowledge of a Tale never mentioned at all in The Lord of the Rings. Its two chief figures, Húrin and his son Túrin are scarcely more than names on a list of elf-friends mentioned by Elrond (FR 2.ii.270). Until The Silmarillion was published in 1977, moreover, no other information was available. We don't even know that Húrin and Túrin are father and son. Húrin and his family might as well have been the cats of Queen Beruthiel. Their story seemed just as unknowable.
What's more surprising is that, as far as I have been able to tell, no one spotted these allusions even after the publication of The Silmarillion. Despite multiple versions of the story appearing across the decades in Unfinished Tales, The Book of Lost Tales I, The Lays of Beleriand, The Shaping of Middle-earth, The Lost Road, The Children of Húrin, and elsewhere.
Part of what we see here is Tolkien's craft. He knows that he can draw on the mythic power of the Tale of the Children of Húrin without needing to draw our attention to the allusions by introducing explanations that would distract from the moment and the momentum of the story; and he can draw on this power in this way precisely because it is mythic and therefore transcends the particular details of the moment. What we see here is yet more evidence for how important these Great Tales are to the narrative and to the characters within it. The connection between the Tale of Frodo and Sam and the larger Tales of which theirs is a part does not need to be made explicit to be effective.
Part of it, finally, is that Sam is on the knife-edge of Tragedy here. If he makes a mistake in his choices, all is lost for him, and all is lost for Middle-earth. Sam, moreover, believing his master to be dead, already sees himself as in a story that has turned tragic. The Tale of the Children of Húrin is the tale for this crisis rather than the Tale of Beren and Lúthien because it is a Tragedy, and Beren and Lúthien, for all of its tragic moments, is a fairy-story that goes beyond sorrow into joy. We talk about Tolkien and fairy-stories far more often than we do about Tolkien and Tragedy. But in On Fairy-stories Tolkien speaks of the two types of story together. Each helps him define the other. He says:
At least I would say that Tragedy is the true form of Drama, its highest function; but the opposite is true of Fairy-story. Since we do not appear to possess a word that expresses this opposite—I will call it Eucatastrophe. The eucatastrophic tale is the true form of fairy-tale, and its highest function.
(OFS ¶ 99)
And if the catastrophe that marks a Tragedy cleanses us or purges us by means of fear and pity, then we can see the parallel between Drama and Fairy-stories even more clearly. For the eucatastrophe that is the 'true form' and 'highest function' of a fairy tale cleanses us through Escape, Recovery, and Consolation. It includes the renewed clarity of 'vision' we gain through Recovery (OFS ¶ 83-84). but goes beyond it by allowing a 'vision' of a transcendent reality (OFS ¶ 103).
There is more to be explored here, which I don't have time for right now. For example, an essential aspect of the situation Sam finds himself in here is the battle he has with Shelob directly before he comes to believe Frodo dead. For the narrator there names both Beren, the fairy-tale hero who also fought giant spiderlike monsters, and Túrin, the tragic hero who slew a dragon by stabbing him from below only to learn terrible truths about his own life in doing so. Sam of course is neither of these great heroes, sons of the chieftains of their peoples, and further reflection on these passages may well help us more deeply understanding of On Fairy-stories, The Lord of the Rings, and how the dynamic balance of Tragedy and Eucatastrophe fundamentally shapes Tolkien's Secondary World.
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If anybody knows of another discussion of these particular allusions to The Children of Húrin in The Choices of Master Samwise, please do let me know. I would be eager to see it.