Located in Iceland, Heaven's Base is the new main headquarters of the Earth Alliance military on Earth. The base replaces JOSH-A, which was destroyed during the First Alliance-PLANT War. It was also used as the headquarters of Logos, at least during the Second Alliance-PLANT War.
After Gilbert Durandal gave his speech about how the world was manipulated by Logos, Earth's population rebelled against Logos and killed several of its members. The remaining members fled to Heaven's Base, which was then attacked by a combined force of ZAFT and defected Earth Alliance forces. Before the assault began Heaven's Base was given the ultimatum to hand over the members of Logos and dismantle. The ultimatum was answered by a barrage of rockets, signaling the start of the battle.
The ZAFT/EA forces were met by a powerful defending force consisting of a large number of GAT-04 Windams, GAT-02L2 Dagger Ls and old GAT-01A1 Dagger mobile suits on the ground and in the air, and aquatic GAT-707E Forbidden Vortex and GAT-706S Deep Forbidden in the water. Heaven's Base also fielded for the first time the new TS-MB1B Euclid mobile armor, based on the prototype YMAF-X6BD Zamza-Zah and YMAG-X7F Gells-Ghe. The defense force also included five GFAS-X1 Destroy Gundams. The heavy fire-power of these machines inflicted heavy casualties on the attacking forces, specifically upon the anti-Logos EA ships and mobile suits (conveniently placed near the front of the formation). When ZAFT launched an attack wave from orbit, Heaven's Base unveiled the powerful Nibelung weapon, which sends out a massive energy burst, similar to the GENESIS superweapon, destroying all ZAFT forces coming from above.
However Heaven's Base defense forces began to crumble when the ZAFT warship Minerva launched its ZGMF-X42S Destiny Gundam, ZGMF-X666S Legend Gundam, and ZGMF-X56S Impulse Gundam. The three suits quickly destroyed the five Destroy units. The loss of the Destroy mobile suits signified a turn in the battle, prompting Lord Djibril to evacuate. He was the only member of Logos to escape, the rest being captured and sentenced for their crimes. It is unknown what happened to the base after the battle.