Can you be more specific, that question is screaming "it's a trap!"
In both Overrun Combat and Combat Intuition, the effects of damage are applied before the regular sequence of move/combat. So if a unit is destroyed in Overrun Combat and/or Combat Intuition's "first strike", that destroyed unit does not get to move/return fire in the regular move/combat sequence.
I'm just wondering if you have something more specific in mind you are asking about.