Ok then, this is obviously going to proceed in an escalation campaign manner. We now have (in the previous two posts) games specifically to advance the story line.
The battle for the Promethium refinary will see if the PLA get the resources they need to take on the Imperial Guard.
There will be a 'running the gauntlet' type senario to see if the Iggies get the resources they need to take on the PLA.
There will be two points for a win, one for a draw and none for a loose. These might well translate into extra strategy points (allowing that side to seize the initative more easily) or apocalypse stategy card thingies (Apocalypse strategic assets ?).
So, scoring the armies wins, draws and defeats seems straight forward enough.