Quote:Situation 1: FoW never materializes
I will do everything I can to avoid having to try and rally the unit in the assault, as odds are he will fail, flee, suffer a parting shot, and be killed. "Everything I can" absolutely includes moving wagons and such one by one waiting for FoW to save me. If I can escape having to rally him next turn, depending on initiative, I might be able to reinforce the assault.
But this can never happen, If FoW does not occur, you MUST attempt to rally the demoralized units per RaW. If they pass great they have a little more chance, but if they fail, they must flee one hex, plus the assaulting units have a good chance of killing them by fleeing fire. Yes, there is a chance to survive, but I have seen more kills than survival of these demoralized units.
As for the reinforcements for the demoralized units, if it recovers then they will come into the assault, but the rule guarantee that the failure of the demoralized unit gets the heck out of there.