Culhwch and Olwen
Said Grugyn, "Except he first take his life, he will never have those precious things. And to-morrow morning we will rise up hence, and we will go into Arthur's country, and there will we do all the mischief that we can."
So they set forth through the sea towards Wales. And Arthur and his hosts, and his horses and his dogs, entered Prydwen, that they might encounter them without delay. Twrch Trwyth landed in Porth Cleis in Dyved, and Arthur came to Mynyw. The next day it was told to Arthur that they had gone by, and he overtook them as they were killing the cattle of Kynnwas Kwrr y Vagyl, having slain all that were at Aber Gleddyf, of man and beast, before the coming of Arthur.
Now when Arthur approached, Twrch Trwyth went on as far as Preseleu, and Arthur and his hosts followed him thither, and Arthur sent men to hunt him; Eli and Trachmyr, leading Drutwyn the whelp of Greid the son of Eri, and Gwarthegyd the son of Kaw, in another quarter, with the two dogs of Glythmyr Ledewig, and Bedwyr leading Cavall, Arthur's own dog. And all the warriors ranged themselves around the Nyver. And there came there the three sons of Cleddyf Divwlch, men who had gained much fame at the slaying of Yskithyrwyn Penbaedd; and they went on from Glyn Nyver, and came to Cwm Kerwyn.
And there Twrch Trwyth made a stand, and slew four of Arthur's champions, Gwarthegyd the son of Kaw, and Tarawc of Allt Clwyd, and Rheidwn the son of Eli Atver, and Iscovan Hael. And after he had slain these men, he made a second stand in the same place. And there he slew Gwydre the son of Arthur, and Garselit Wyddel, and Glew the son of Ysgawd, and Iscawyn the son of Panon; and there he himself was wounded.
And the next morning before it was day, some of the men came up with him. And he slew Huandaw, and Gogigwr, and Penpingon, three attendants upon Glewlwyd Gavaelvawr, so that Heaven knows, he had not an attendant remaining, excepting only Llaesgevyn, a man from whom no one ever derived any good. And together with these, he slew many of the men of that country, and Gwlydyn Saer, Arthur's chief Architect.
Then Arthur overtook him at Pelumyawc, and there he slew Madawc the son of Teithyon, and Gwyn the son of Tringad, the son of Neved, and Eiryawn Penllorau. Thence he went to Aberteivi, where he made another stand, and where he slew Kyflas the son of Kynan, and Gwilenhin king of France. Then he went as far as Glyn Ystu, and there the men and the dogs lost him.
Then Arthur summoned unto him Gwyn ab Nudd, and he asked him if he knew aught of Twrch Trwyth. And he said that he did not. And all the huntsmen went to hunt the swine as far as Dyffryn Llychwr. And Grugyn Gwallt Ereint, and Llwydawg Govynnyad closed with them and killed all the huntsmen, so that there escaped but one man only. And Arthur and his hosts came to the place where Grugyn and Llwydawg were. And there he let loose the whole of the dogs upon them, and with the shout and barking that was set up, Twrch Trwyth came to their assistance.