Grond, also known as the Wolf's Head, was a one hundred-foot long battering ram with a head in the shape of a ravening wolf. Though named for Morgoth's Warhammer, it was created in the likeness of the Wolf of Angband, Carcharoth.
"Great engines crawled across the field; and in the midst was a huge ram, great as a forest-tree a hundred feet in length, swinging on mighty chains. Long had it been forging in the dark smithies of Mordor, and its hideous head, founded of black steel, was shaped in the likeness of a ravening wolf; on it spells of ruin lay. Grond they named it, in memory of the Hammer of the Underworld of old. Great beasts drew it, orcs surrounded it, and behind walked mountain-trolls to wield it."