The Thunder Pass is a mountain pass in eastern Frostfire Ridge, which the Iron Horde intended to use during their invasion of Frostfire and their war against the Frostwolf orcs. However, as the Iron Horde were traveling through the pass, they encountered the Frostwolves and their new allies, and a battle broke out between the two forces. While Ga'nar held the Iron Horde's forces at bay, Drek'Thar collapsed the pass in order to ensure a Frostwolf victory over the Iron Horde.
After the battle, Makar Stonebinder can be found standing next to the rubble, offering to give players a vision of the battle, while Ga'nar's companion Snowfury mournfully digs at the boulders that killed his master.
Afterward, an Iron Stonegrinder was put on the opposite side, facing the boulders.