during clan war let's say the attacker forgot the barbarian king was resting and doesn't have him for the clan war;you can not go back and must attack the base or surrender. As long as the attacker does not send any troops or doesn't use a spell to attack the base, can Supercell give a option to leave the battle without surrendering and not counting as an attack. So that the attacker can get his best troops and spells that the attacker forgot for the battle.
