Related Rule
Togo
Practice Relating to Rule 70. Weapons of a Nature to Cause Superfluous Injury or Unnecessary Suffering
Togo’s Military Manual (1996) states: “It is prohibited to resort to weapons or methods of warfare of a nature to cause unnecessary losses or superfluous injury.” 
Togo, Le Droit de la Guerre, III fascicules, Etat-major Général des Forces Armées Togolaises, Ministère de la Défense nationale, 1996, Fascicule II, p. 5.
In 1974, during discussions in the Ad Hoc Committee on Conventional Weapons established by the CDDH, the representative of Togo stated:
His delegation could not accept the concept of “unnecessary suffering”. It considered that suffering could not be divided into categories. The Committee’s report should state solemnly that the infliction of suffering was immoral and incompatible with human dignity. 
Togo, Statement at the CDDH, Official Records, Vol. XVI, CDDH/IV/SR.1, 13 March 1974, p. 16, § 46.