Can I retreat units from a battlefield I conquered last round, move ready units from my base to it again, and gain another point?

Ruling: No, you cannot gain another point. You can only score 1 point per battlefield per turn, whether by conquering or holding.

Nuances:

• You only conquer battlefields you did not score this turn
• Effects that trigger "when you conquer" cannot be triggered again on a battlefield you already scored this turn
• The 1 point limit applies to either method of scoring (conquering or holding)