During the War of the Ring, Sauron doesn't just send forces against Gondor. He has enough armies to reach into Rohan/Lorien lands, and towards Dale too. The Men and Dwarves of the Lonely Mountain are also fighting a great battle simultaneously as it is. The northeastern corner of the map didn't sit out of the fight, we just know less about it.
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You passed from under darkened dome, you enter now the secret land. - Take me to Finrod's fabled home!... ~ Finrod: The Rock Opera
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