If you retreat a unit from a battlefield you already scored a point from by holding, and then conquer it again in the same turn, do you score another point?

Ruling: No, you cannot score another point. You can only score each battlefield once each turn, so if you gain a point by holding, you cannot conquer the same battlefield that turn.

Nuances:

• You will also not get any "When you conquer" triggers if you've already scored from that battlefield by holding it.