Practice Relating to Rule 15. The Principle of Precautions in Attack
Section B. Avoidance or minimization of incidental damage
New Zealand’s Military Manual (1992) states:
An attack on a military objective may not be considered indiscriminate, disproportionate or otherwise unlawful simply because there is a risk of collateral injury to civilians or civilian objects. Civilian casualties or damage incidental to attacks on legitimate military objectives are therefore not unlawful. Such injuries and damage, however, should not be disproportionate (that is, clearly excessive in relation to the concrete and direct military advantage anticipated from the attack) and every feasible precaution must be taken to minimise them.