Wyre wrote:
1) Does it matter at all if the unit takes just one casualty or one hundred? Is it still the same morale check?
It does matter, there is a formula after which the game acts that results in this curve:

The spot for a 50:50 chance to trigger a moral check is at 25 casualties.
Just to clarify:
- Fire casualties can result in a moral check if the test to trigger is failed. So higher fire casualties make a moral check to happen more likely but don't guarantee because the curve gets flatter and even with 500 casualties you only get a 95,24% chance to trigger a moral check.
- A melee guarantees a moral check.
These facts usually, at least in phased gameplay, result in the different way to play the two factions because usually:
- Confederate units are smaller but with a higher quality value
- Union units are larger but with a lower quality value
Wyre wrote:
2) Does a disrupted unit have an increased chance of a rout and failing a morale check?
Yes as a disrupted unit losses 1 level of moral. AFAIk all the usual modifiers apply:
• If the unit is stacked with a Leader, then 1 is added to the Morale.
• If the unit is Low On Ammo or Out Of Ammo, then 1 is subtracted from the Morale.
• If it is a Night turn, then 2 is subtracted from the Morale.
• If the unit has Medium Fatigue, then 1 is subtracted from the Morale.
• If the unit has High Fatigue, then 2 is subtracted from the Morale.
• If the unit has been fired upon Enfilade, then 2 is subtracted from the Morale.
• If the unit is Disrupted, then 1 is subtracted from the Morale.
• If the unit is in a hex with units from other brigades, then 1 is subtracted from the Morale.
_________________
Lieutenant General Christian Hecht
Commander I Corps, Army of the Potomac
"Where to stop? I don't know. At Hell, I expect."