|Battle of the Gwathló|
|Conflict: War of the Elves and Sauron|
|Date: SA 1700|
|Place: Tharbad in Eregion|
|Outcome: Decisive victory for Elves and Númenorians over Sauron|
|Elves of Lindon and then Numenorians||Sauron's forces|
| Lord Gil-galad|
King Durin III
| Dark Lord Sauron|
|10-20,000 Elves and 40,000 Númenorians, along with Dwarves of Durin's Folk||80,000 Orcs, 4,000 Easterlings, 1,000 Southrons, and other creatures of Sauron|
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 Númenorians 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 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 overlordship of Middle-earth.