Battle of the Pelennor Fields
Before the Battle of the Pelennor Fields, the Great Gate was breached by Sauron's forces led by the Witch-king of Angmar. He spoke "words of power" as the battering ram named Grond attacked the Great Gate; it burst asunder as if "stricken by some blasting spell", with "a flash of searing lightning, and the doors tumbled in riven fragments to the ground. The Witch-king rode through the Gate where Gandalf awaited him, but left shortly afterwards to meet the Riders of Rohan in battle. Gondor, with the support of Rohirrim as cavalry, repelled the invasion by Mordor. Following the death of Denethor and the incapacity of Faramir, Prince Imrahil became the effective lord of Gondor.