Related Rule
Togo
Practice Relating to Rule 46. Orders or Threats That No Quarter Will Be Given
Togo’s Military Manual (1996) states that it is prohibited “to order that there shall be no survivors, to threaten the enemy therewith or to conduct operations on such a basis”. 
Togo, Le Droit de la Guerre, III fascicules, Etat-major Général des Forces Armées Togolaises, Ministère de la Défense nationale, 1996, Fascicule III, p. 12.