First post is up. The deal is this; we have a forested/rolling hills sort of area because I am envisioning the Dirty Dozen with Space Marines and because they need to commandeer some Rhino APC's. 

Beyond that, I left it somewhat open so people can improvise on what the deployment is (do they start on the outskirts and cut down sentries or do they land hard in the middle and start killing, or is there a split of forces to try to do both?) and what the enemy forces look like. 

It's also worth noting that the entire militia is not corrupted, but character actions can determine whether or not some of them break off and flee (or fight alongside) or simply get wiped out due to suspicion.

Also, they're probably suspicious too. Odds are, they've seen some traitor marines. Of course, characters are displaying loyalist symbols, some of them anyway, so that might help.