§ Of Beren and Lúthien The Silmarillion

In this way the hiding of Barahir was revealed, and Morgoth drew his net about it; and the Orcs coming in the still hours before dawn surprised the men of Dorthonion and slew them all, save one. For Beren son of Barahir had been sent by his father on a perilous errand to spy upon the ways of the Enemy, and he was far afield when the lair was taken. But as he slept benighted in the forest he dreamed that carrion-birds sat thick as leaves upon bare trees beside a mere, and blood dripped from their beaks.