Can I play a unit to a battlefield I'm holding after moving my only unit away from it?

Ruling: No, you cannot play a unit to a battlefield after moving your only unit away from it, as you lose control when you no longer have units there.

Sequence:

• If you want to maintain presence, play the new unit to the battlefield first
• Then move the original unit away

Nuances:

• Scoring a point by holding a battlefield does not grant you control for the remainder of the turn; control requires having units present