The introduction to the mission "Zero Hour" with Jim Raynor and Tychus learning of a Zerg attack.
Full Text Guide for this mission: http://www.associatedcontent.com/article/5630168/starcraft_2_wings_of_liberty_mission.html
To see this mission completed on hard difficulty and how to get the "the Best Defense.." achievement go here:
Part 1: http://www.youtube.com/watch?v=_iiK3z0ULI4
Check here for more:
http://www.associatedcontent.com/user/803546/standard_of_entertainment.html
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