fight fire with fire in French
fight fire with fire in French
combattre le feu par le feu
(idiomatic) To respond to an attack with a similar or identical counter-attack (e.g. to respond to gunfire with reciprocal gunfire).
combattre le mal par le mal
(idiomatic) To respond to an attack with a similar or identical counter-attack (e.g. to respond to gunfire with reciprocal gunfire).