The Army of Darkness

They rode in silence through sparse woodland where the trees leaned drunkenly away from the sea. The nervous whinny of horses and the clank of steel guided them back to Renly's camp. The long ranks of man and horse were armored in darkness, as black as if the Smith had hammered night itself into steel. There were banners to her right, banners to her left, and rank on rank of banners before her, but in the predawn gloom, neither colors nor sigils could be discerned. A grey army, Catelyn thought. Grey men on grey horses beneath grey banners. As they sat their horses waiting, Renly's shadow knights pointed their lances upward, so she rode through a forest of tall naked trees, bereft of leaves and life.

--George R.R. Martin, A Clash of Kings