§ Of Beren and Lúthien The Silmarillion

Therefore, since daily Carcharoth drew nearer to Menegroth, they prepared the Hunting of the Wolf; of all pursuits of beasts whereof tales tell the most perilous. To that chase went Huan the Hound of Valinor, and Mablung of the Heavy Hand, and Beleg Strongbow, and Beren Erchamion, and Thingol King of Doriath. They rode forth in the morning and passed over the River Esgalduin; but Lúthien remained behind at the gates of Menegroth. A dark shadow fell upon her and it seemed to her that the sun had sickened and turned black.