[Tuor of Gondolin]

Originally posted by Vanya
"Does anyone know the answer to my question- when did Gondor help Rohan?"
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Just after Helm Hammerhand died in the Long Winter:
"The Eastern Invaders perished or withdrew; and help came at last from Gondor, by the roads both east and west of the mountains". (Appendix A, LOTR).

Perhaps the most enlightening selection in "Unfinished Tales" is on "The Battle for the Fords of Isen", not just the battle but also the footnotes, with details on the Rohirrim's organization.

And if you put together sections on Tuor in the Silmarillion and U.T. you've got the story of Tuor up to Gondolin, still missing his bio in Gondolin or after, although I believe there's some material in HoME.

But there's an enormous amount of fascinating material throughout U.T., including the dysfunctional royal Numenorian couple.