Practice Relating to Rule 15. The Principle of Precautions in Attack
Section B. Avoidance or minimization of incidental damage
Sierra Leone’s Instructor Manual (2007) states:
[The principle of proportionality] requires an assessment of likely casualties, both military and civilian, and damage compared with the specific military advantage expected from the attack … The aim is to avoid or at the very least minimize collateral damage.
[emphasis in original]