Bombardment units in assault hexes

[treadasaurusrex]

I think that this comes down to a question of scale.

At PG scale, if an emplaced mortar or artillery platoon is in a 200 meter assault hex, it's very vulnerable to incoming fire & melee effects and should not be able to fire at the attackers with bombardment fire. It should be able to fire the platoon's (relatively weak) small arms at the attackers at close range as abstractly allowed in the assault rules.

 At least, dug-in artillery/mortars get first fire, before they are typically overwhelmed -- if they are by themselves -- in an assault hex.