Every distinct wording since 2010, newest first.
August 7, 2026 · The Hobbit
A battle can’t be attached to players or permanents, even if it is also an Aura, Equipment, or Fortification. If a battle is somehow attached to a permanent, it becomes unattached. This is a state-based action (see rule 704).
April 14, 2023 · March of the Machine
If a battle that isn’t being attacked has no player designated as its protector, or its protector is a player who can’t be its protector based on its battle type, its controller chooses an appropriate player to be its protector. If no player can be chosen this way, the battle is put into its owner’s graveyard. This is a state-based action (see rule 704).