|Battle of the Gwathló|
|Conflict: War of the Elves and Sauron|
|Date: SA 1700|
|Place: Tharbad in Eregion|
|Outcome: Decisive victory for Elves and Númenóreans over Sauron|
|Elves of Lindon and Numenorians||Forces of Sauron|
| High King Gil-galad|
|Dark Lord Sauron|
|A large host of Elves and Numenoreans||Possibly tens of thousands of orcs and other peoples who served Sauron|
|Light||Near-complete annihilation; Sauron himself barely escaped and, along with a bodyguard, were all that was left of his great host|
|War of the Elves and Sauron|
The Battle of the Gwathló was the decisive battle of the War of the Elves and Sauron that brought an end to Sauron's power for many centuries.
After being driven off to the south-east of Eriador after heavy losses at Sarn Ford, Sauron's forces regrouped and joined with his forces in Tharbad where they were assailed by the pursuing forces of Gil-galad, and then by a force of Númenóreans coming up through the Greyflood and attacking from their rear.
In the battle Sauron and his armies were utterly routed. The remaining survivors narrowly escaped but were assailed by Elrond just east of Calenardhon and destroyed, leaving Sauron with little more than a bodyguard to safely escape back into Mordor.
The ensuing victory left Sauron crippled but not defeated and being unconquered he slowly rebuilt himself throughout the ages until the thirty-third century, when he challenged Ar-Pharazôn for the over-lordship of Middle-earth.