Harold, the Last of the Saxon Kings Book VII: The Welch King by Edward Bulwer-lytton

The fugitive Britons, scarce one-tenth of the number that had first rushed to the attack, -- performed their flight with the same Parthian rapidity that characterised the assault; and escaping both Welch foe and Saxon, though the former broke ground to pursue them, they gained the steeps of Penmaen.

There was no further thought of slumber that night within the walls. While the wounded were tended, and the dead were cleared from the soil, Harold, with three of his chiefs, and Mallet de Graville, whose feats rendered it more than ungracious to refuse his request that he might assist in the council, conferred upon the means of terminating the war with the next day. Two of the thegns, their blood hot with strife and revenge, proposed to scale the mountain with the whole force the reinforcements had brought them, and put all they found to the sword.