Chaos took back the laser complex:

Now Chaos can use 3 types of artillery

pick one before the battle

Smoke, Napalm and High explosive

I can go over the rules on Monday night

Napalm rules are in the new Wight Dwarf in the city's of death update .

High Explosive rules are normal Bombardment rules.

Sam roll 2 d6 pick the highest

Scooter roll 1 d6

and then pick a place to move.