Norma relacionada
Practice Relating to Rule 145. Reprisals
Section C. Proportionality of reprisals
Benin’s Military Manual (1995) states that reprisals “may only be used if: … they are proportional to the violation of the law of war committed by the enemy”. 
Benin, Le Droit de la Guerre, III fascicules, Forces Armées du Bénin, Ministère de la Défense nationale, 1995, Fascicule III, p. 13.