Related Rule
Guatemala
Practice Relating to Rule 85. The Use of Incendiary Weapons against Combatants
In 1973, in response to Resolution 2932 A (XXVII) in which the UN General Assembly asked States to comment on the report of the UN Secretary-General on napalm and other incendiary weapons and all aspects of their possible use, Guatemala stated: “It is necessary to make renewed efforts for the legal prohibition of the use of weapons that cause unnecessary suffering in all armed conflicts, especially the mass use of incendiary weapons.” 
Guatemala, Reply of 10 August 1973 sent to the UN Secretary-General, reprinted in Report of the Secretary-General on napalm and other incendiary weapons and all aspects of their possible use, UN Doc. A/9207, 11 October 1973, p. 8.