One of the most pivotal battles in J. R. R. Tolkien's The Lord of the Rings was the Siege of Minas Tirith from The Return of the King. The forces of Sauron, which included Orcs, Haradrim, Easterlings, Nazgûl, trolls, and many beasts of war, assaulted Gondor's capital city. Leading Sauron's army was the Witch-king of Angmar, whom Tolkien referred to as the Black Captain in this section of the novel. The wall that surrounded Minas Tirith was impenetrable, so the Orcs' only hope of entering the city was to destroy its Great Gate.
Source：https://www.cbr.com/lord-of-the-rings-orcs-grond-explained/
