When King Ondoher led his army to face the Wainriders who threatened Gondor, Adrahil commanded the army's left wing. The soldiers of the right wing were under the command of the King's nephew Minohtar, while the centre was commanded by the king himself and his heir Artamir.
Ondoher's enterprise came to a devastating end: he was surprised by the Wainriders, and his forces were overwhelmed. Adrahil's soldiers, however, were shielded from the attack and survived it. Ondoher and Artamir had both been killed, and Minohtar took charge, sending Adrahil south into Ithilien to form a defensive line from Cair Andros to the Ephel Dúath.
Adrahil's story was never completed, so his fate is uncertain. We know that the Wainriders eventually broke through Minohtar's more northerly defence, but whether they penetrated to Adrahil's position is unknown. If he survived the initial Wainrider assault, it seems likely that Adrahil would have joined with Eärnil in his counter-attack, seeing the ultimate defeat of the Wainriders at the Battle of the Camp.
Adrahil and the Princes of Dol Amroth
In the chapter Cirion and Eorl of Unfinished Tales Adrahil is referred to as "Adrahil of Dol Amroth". However, since Dol Amroth would not be named as such until after the drowning of Amroth in Third Age 1981 this must be an anachronistic error on the part of the chroniclerTemplate:Ref. His exact contemporary title is unknown but he was a PrinceTemplate:Ref; a title given to the Númenorean noble house that settled in Belfalas by Elendil in the Second AgeTemplate:Ref. Because of this, it is assumed he was an ancestor of Imrazôr, Galador and the Princes of Dol Amroth.