You Need a Target to Battle
ClarificationRoot
You can only battle a player who has at least one piece (warrior, building or token) in that clearing. If they have buildings or tokens but no warriors, you can still battle them, and they're defenseless, taking 1 extra hit.
See also
- Battle (the rule this clarifies)
Also answers
defender has no warriorsno warriorsbattle empty clearingno pieces to battlebattle without warriorsdefenseless defenderis defenseless