Disaster of the Morannon
This article describes a concept which is mentioned in J.R.R. Tolkien's works, but was never given a definite name.
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 Events Prior to the Battle
 The Battle
Gondor's host marched on the alliance of Wainriders in the north, attempting to rout them once and for all from Gondor's northern borders; however, the Wainriders and their allies, bitter from previous defeats, attacked them with vengeance. Their cavalry swept over Ondoher's army and utterly defeated them. Ondoher and his eldest son Artamir were killed, and the Wainriders were victorious. They celebrated at their camps after the battle, feasting in honor of their victory.
Gondor referred to the battle as The Disaster of the Morannon. It is unknown if the Wainriders gave quarter to King Ondoher's forces, though it is known that his army was almost entirely crushed. Some of his troops managed to escape, however, and fled southward where they joined up with Gondor's Southern Army, which quickly marched north to catch the Wainriders by surprise during their celebrations.