Can units from a base and units with ganking from a controlled battlefield attack the same opponent battlefield in a single wave, or must they attack separately?

Ruling: Units from a base and units with ganking from a controlled battlefield can attack the same opponent battlefield in a single wave, as long as the destination is the same.

Sequence:

• Any number of units can move from anywhere to the same destination
• All units arrive together in a single wave
• One showdown is resolved, not multiple separate showdowns