I found this tale in one of the manuscripts woven by Vairë in the Halls of Mandos.
Yondaimë and the Kyuubi
Contrary to popular belief, the winged Dragons were not the greatest of Morgoth's monsters. The title rightfully belongs to the Kyuubi, a powerful Ainu--originally a Maia of Oromë--in the form of a nine-tailed Warg. Yet the Kyuubi did not issue from the pits of Angband, for he saw the victory of the Host of Valinor. As Eönwë and his warriors descended into the Halls of Morgoth, he fled to the east of East, near the ancient region of Hildórien.
In that region was a little village named Konoha, where dwelt the remnant of the Edain who refused the summons of Morgoth. They saw the onslaught of the giant Warg, and they were seized with fear. But their leader, Yondaimë, said to them, "Fear not, for he shall not ravage your home while I yet live." So he went on to face the Kyuubi in the forest surrounding Konoha, and their dreadful battle began.
The Warg mocked the Man, saying, "Foolish one, weakest of Men, and they least of all that speak, will you now dare to battle the great Kyuubi?"
Yondaimë said naught in return, but summoned the giant frog Gama Bunta, who dwelt in the deeps of Cuiviénen. Then, riding upon his steed, he charged upon the Kyuubi, yet the Warg leaped away, and with one of his tail he swept the legs of Gama Bunta from under him. The frog of Ulmo fell to the ground, and Yondaimë's body was broken beneath him. Knowing that his death was near, Yondaimë prayed to Eru, "Might I still the mighty beast that dares to destroy our estel. Eru give me strength!"
And Eru, from beyond Arda, hearkened to his prayer, and he sent Mandos to Yondaimë. "The spirit of the Kyuubi you may send to my halls," he said, "yet only if you take him there. Then you must depart the world, for none of the mortals who see my halls return ever to the mortal lands, save Beren, who had a fate apart."
Yondaimë consented, and, departing his body, he wrested the spirit of the Kyuubi from his body, and brought him to the Halls of Mandos, where none can escape, neither Ainu, nor Elf, nor mortal Man. Upon the completion of his task, he left Arda, and was never seen again, noblest of mortal Men.
Here are the pictures of some of the tapestries that depict the dread battle: