As part of a local campaign, my base on the ice world of Ghast is about to fall under attack by Grey Knights. Obviously, this cannot be allowed to happen.
The mission will be "Grand Assault" - all of the buildings will begin under my control, and he must plant his flag in all of them in order to force my total evacuation.
In compiling a defensive list, I have several questions for you all. Let's begin with: put my forces in raiders/venoms, or take larger units on foot?