Question regarding immortality

[Aderion]

Hi everyone,

as the title says, I have a question regarding immortal units.

If such a unit dies by retreating into a hostile province, does the immotal ability work or does the unit have to die in combat?

And in case it works, must the dominion in the province the unit tried to retreat to be friendly for the unit to be ressurected or is the dominion of the province from which the unit retreated the deciding factor?