Question: Rallying

[Warmonger]

A few questions related to rallying:

1. What does the rally factor represent? Is it a success probability? That is, does a value of 60 mean 60% probability of a successful rally?

2. Are there other factors affecting rallying? I notice that units routing/retreating in company of other units doing the same are more difficult to rally.

3. What governs whether a unit will retreat/rout? I've seen units with suppression in the 90's sit while others with suppression in the 40's run. The oddest case I've seen so far is a unit which sat for four turns with a rout status while the battle moved past it then suddenly take off and run. It caught up to the battle and got shot to pieces.