If enemy infiltrators set up with 4D6" of a model with a surveyor then the model is allowed to take a 'free' shot at them. If the model is part of a unit, the whole unit may shoot. These shots are taken before the battle begins and may cause the infiltrators to fall back.
The Imperial Guard player may re-roll one Reserves roll per turn, adn to re-roll the dice when checking to see if an enemy unit or obstacle is hit by a preliminary bombardment
All models aboard may shoot but +1 is added to any Damage Rolls made against the vehicle. Template and Blast weapons cause double the normal number of hits against light vehicles.
12
10
3
Template
5
4
Assault 1
36"
Heavy 3