Practice Relating to Rule 18. Assessment of the Effects of Attacks
Cameroon’s Instructor’s Manual (1992) states:
The principle of proportionality rests on the prohibition to launch attacks which will cause losses to civilian populations and damage to civilian objects which are excessive in relation to the anticipated military advantage.
Cameroon’s Instructor’s Manual (2006), under the heading “Precautions Required by the Law of Armed Conflict and International Humanitarian Law”, states with regard to the planning stage: “[E]nsure that an action does not cause civilian losses or damage that would be excessive in relation to the importance of the result anticipated from the entire operation.”