Mountain Ascent First off, know that the Compies you see will not attack you if you don't attack them. Hug the right wall when you first start off to pick up a Scope for your Pistol. Follow the path ...

Halls Of Battle Walk forward and take out all the Slegs. Climb up ramps to go into other hallways and throw console switches. There's going to be a part where you enter this room with a large pillar ...