In 2485 the Terran Confederacy confronted the Kel-Morian Combine at the Noranda Glacier vespene refinery at Onuru Sigma. The vespene was contaminated with hydrogen sulfide, rendering it explosive.

By this point, the Confederacy believed the Kel-Morians were planning something big in that area. A detachment of Confederate Alpha Squadron led by Captain Edmund Duke and a detachment of the 33rd Ground Assault DivisionDominion section – led by Captain Arcturus Mengsk advanced on the dilapidated-looking complex, only to fall into an ambush. Many of the "abandoned" structures turned out to be strongpoints.

Duke lost many men recklessly charging the stronghold and had to take shelter in a strongpoint they had captured. Meanwhile, Mengsk called on Wraith air support to strafe the complex. As Mengsk's forces approached cautiously, they took fire, and many marines were killed or injured. A Wraith blew up a truck filled with vespene, and eventually the whole complex burst into flame as Mengsk's forces escorted the Alpha Squadron troops to relative safety.

The Confederates retreated, especially when they heard about Kel-Morian brigades and capital ships approaching the area. War was declared, and terms of service increased.[1]


  1. McNeill, Graham (December 30, 2008). StarCraft: I, Mengsk. Simon & Schuster (Pocket Star). ISBN 1416-55083-6.
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