What happens when an attacker survives a showdown at a battlefield but the defender also has surviving units?

Ruling: If after the damage step both players still have units alive at the battlefield, the attacking units are recalled back to the base.

Sequence:

• Showdown occurs at the battlefield
• Damage is dealt (stunned units don't deal damage)
• If both players have surviving units after damage, attackers are recalled to base
• Recalled units remain exhausted if they were exhausted when they entered the showdown