Billions of zerg were lured to Tarsonis, laying waste to the Confederacy's defenses. The protoss followed, descending upon the zerg's primary hive.[21]
Mengsk ordered Kerrigan to protect the primary zerg hive from the protoss Expeditionary Force, allowing the zerg to complete the Confederacy's destruction. Jim Raynor was increasing uncomfortable with Mengsk's leadership and motivations, but was unable to convince Kerrigan to allow him to accompany her.[21] Kerrigan completed her mission but was in turn overrun by the zerg.