- "We must, now, take this fight to the Locust!"
- —Chairman Richard Prescott during his speech to the Gears before Operation: Hollow Storm.
The Assault on the Inner Hollow was a major battle of Operation: Hollow Storm. It was meant to be a turning point during the Locust War with the Coalition hoping that taking their forces underground to the home of the Locust would finally end the war. Thousands of Gears are escorted from Jacinto City to Landown through the Stromson Forest by the Assault Derricks, King Ravens, Centaurs and APCs in order to launch underground in Landown. Upon several hours of fighting, the Coalition realized that their information was incorrect. While they managed to strike a significant Locust citadel, it was not the home and source of the Locust and their leader, Queen Myrrah. During the battle, the Coalition discovered that a gargantuan worm known as the Riftworm was responsible for sinking the cities of Tollen and Montevado as it sunk the city of Ilima during the assault. Hundreds of Gears were killed and captured by the Locust, signifying a loss in the Locust War, though the battle led to the destruction of the Riftworm.