Battle of Chau Sara

The Battle of Chau Sara began when the zerg Overmind reached the Terran Confederacy colony of Chau Sara by 2499. It seeded the atmosphere with spores, subtly infesting the soil.

In November 2499, the Terran Confederacy lost control of one of its experiments at the Flannum Installation on Chau Sara.

The Confederate forces eventually defeated the zerg, beating them back from the capital, Los Andares. The Confederacy controlled all communication and travel to the planet, hiding the events of the battles.

The Zerg Swarm took over Chau Sara, but by next month, Tassadar's Koprulu Expeditionary Force arrived there. The Conclave ordered the fleet to begin a purification operation against the planet. The Overmind ordered its forces to hold back so it could observe the operation. All life on the surface of the planet was extinguished.

Confederate colonel Edmund Duke launched a clumsy counterattack against the protoss fleet. Tassadar retreated out of respect for the terrans' bravery.