This is the third campaign mission in Starcraft II. The goal of this mission is to defend your base and survive until the air support can evacuate you. This first run through is on Normal difficulty in order to get the "Hold the Line" achievement for not losing one building/structure during the mission. The next video will be in Hard mode to get the "The Best Defense..." achievement. SO far it is almost impossible to do all three achievements in one play through of Hard Mode for this mission. But for now, this is the normal mode run through, and the Hard mode will be next. This article includes the text walkthrough as well, to provide better detail on what is actually occuring in the video. The video is available in 1080p HD resolution.