Related Rule
Practice Relating to Rule 17. Choice of Means and Methods of Warfare
Cameroon’s Instructor’s Manual (1992) states:
The general rule [to spare civilians and civilian objects] implies the duty to choose and to use means of combat with a view to avoiding civilian losses and damage to civilian objects or with a view to minimizing civilian losses and damage to civilian objects which are unavoidable. 
Cameroon, Droit international humanitaire et droit de la guerre, Manuel de l’instructeur en vigueur dans les Forces Armées, Présidence de la République, Ministère de la Défense, Etat-major des Armées, Troisième Division, Edition 1992, p. 95.
Cameroon’s Instructor’s Manual (2006) states:
Precautions required by the law of armed conflict and international humanitarian law
The aim of these precautions is to minimize civilian and military losses:
- Superfluous suffering that is not justifiable for the domination of the adversary is prohibited. Generally, it is prohibited to use means or methods of warfare of a nature to cause unnecessary losses … or excessive suffering.
- The military and tactical context must take into account the military objectives, civilian objects, the lines of attack and defensive positions. Furthermore, the expression “if the tactical situation permits” refers to a precaution or a measure which must be taken if it is compatible with the mission. 
Cameroon, Droit des conflits armés et droit international humanitaire, Manuel de l’instructeur en vigueur dans les forces de défense, Ministère de la Défense, Présidence de la République, Etat-major des Armées, 2006, p. 223, § 224.