In The Lord of the Rings: The Return of the King, the giant battering ram used against Minas Tirith is called Grond.
Grond is a massive siege weapon carried by Sauron’s forces during the assault on Gondor. It is shaped like a monstrous wolf’s head and is used to attack the Great Gate of Minas Tirith. The weapon’s repeated impacts help create one of the film’s most recognizable siege images.
Its name recalls an older weapon from Middle-earth history: in Tolkien’s legendarium, Grond was also the mace used by Morgoth in his battle with Fingolfin. The film focuses on the battering ram, making the name easy to associate with the attack on Minas Tirith.
Grond is sometimes confused with Gothmog, the commander of the Orc forces, or with Brego, Théoden’s horse. “Hammerhand” refers to Helm Hammerhand, a legendary king of Rohan, not the siege weapon.