When the zerg invaded Tarsonis, New Gettysburg space platform became the site of their primary hive from which they launched attacks on the Confederate forces. However, a protoss force sent by Executor Tassadar threatened to divert the zerg from these attacks, potentially allowing the Confederates to escape. To prevent this, Sons of Korhal leader Arcturus Mengsk dispatched Lieutenant Sarah Kerrigan to keep the protoss at bay so that the zerg could continue their attacks unabated.