During the War of the Ring, Sauron and his ally Saruman sent a band of Uruk-hai, Mordor Orcs and Moria Orcs. The Mordor Orcs were led by Grishnákh, an orc captain tasked with taking the hobbits back to Mordor. The orcs managed to kill the Gondorian warrior Boromir and to capture Merry and Pippin who they had mistaken for Frodo and Sam. However, as they left Amon Hen the orcs began to quarrel over where to take the two hobbits. The Mordor Orcs had received orders to take them to their master Sauron while the Uruk-hai wanted to take them to Saruman in Isengard. Since the orcs of Isengard were more numerous than the ones from Mordor, Grishnákh's band was forced to follow the Uruks. The orc captain secretly planned his next move and left the group to call reinforcements. At night near Fangorn Forest, the orcs were all killed by the Riders of Rohan.
Other orcs were led by the Witch-king against the forces of Gondor at the battle near Pelennor Fields. The rest of the Mordor Orcs perished at the Battle of the Black Gate or during the destruction of the Dark Tower.
Portrayal in adaptations Edit
The Lord of the Rings film trilogy Edit
In Peter Jackson's The Lord of the Rings film trilogy, Mordor Orcs form up the bulk of Sauron's army. They are used both as soldiers and as work force. Gandalf states that the orcs of Mordor resist the light of day better than others.
In The Fellowship of the Ring, Orcs resembling those of Mordor first appear in Isengard shortly after Gandalf has been imprisoned by Saruman. They cut down Isengard's trees, and begin to breed the Uruk-hai from out of deep pits and caverns.
In The Two Towers, Grishnákh leads a band of orcs from Mordor in order to make the Uruk-hai Scouts to hurry up with the hobbits to Isengard. Bands are later sent by both Sauron and Saruman to raid the villages of Rohan along Uruks and Dunlendings.