 When a player uses a deployed Ally or Aide to attack or defend, they must Tap that card and it cannot be used again until the next turn.This may leave the player open to an attack from another player, so it becomes important to have multiple elements of attack and defense deployed at all times.Also, Tactic cards make it possible for one player to interfere with an attack occurring between two other players and influence the outcome without using any of the interfering player's Allies or Aides.