Is a unit considered attacking when you move to an empty battlefield?

Ruling: No, moving to an open battlefield causes a showdown but not a combat. A unit is not considered attacking in this scenario.

Nuances:

• If you attack and there's an enemy unit, but the enemy unit dies before combat occurs, your unit is still considered attacking because once a combat started, it stays a combat.
• If you kill all opposing enemies in a combat showdown using an action spell, the showdown does not instantly end - you still continue with both sides able to play actions and reactions until both players pass consecutively.