Practice Relating to Rule 14. Proportionality in Attack
The Military Manual (1993) of the Netherlands states:
During an attack on a military objective, the collateral damage (loss of civilian life and damage to civilian objects) may not be excessive in relation to the military advantage anticipated from the attack. In every combat action, therefore, the commander must assess whether the action is to take place in the proximity of civilians or civilian objects.
The Military Manual (2005) of the Netherlands states that “the humanitarian law of war” limits “military force in order to avoid … unnecessary suffering”.
The manual lists “proportionality and subsidiarity” as one of five “generally accepted principles of the humanitarian law of war”.
The manual further states:
Collateral damage and degree of force used must not be excessive in relation to the expected military advantage. This is known as the principle of proportionality. Proportionality implies that no more force may be used than is strictly necessary to achieve the set purpose. Moreover, no more force must be used than necessary to defeat the enemy. The principle of subsidiarity requires a commanding officer, when choosing from a number of means, to choose that which causes the least collateral damage. The principles of proportionality and subsidiarity are developed further in Chapter 5 (points 0541 ff.) and elsewhere.
During the Second Gulf War, the Iraqi military had placed aircraft in hangars in residential districts. To destroy these aircraft from the air, by indiscriminate bombing, would not have been proportionate. In any case, since the aircraft were in hangars in residential districts, they posed no direct threat, and indiscriminate bombing would undoubtedly have caused (severe) collateral damage to civilian property.
[emphasis in original]
In its chapter on behaviour in battle, the manual states that “disproportionate damage to civilian objects and the civilian population caused by attacking military targets must be limited”.
The manual also states:
0516. The following attacks are also considered indiscriminate:
- attacks which may be expected to strike the civilian population excessively hard. AP I [1977 Additional Protocol I] describes these as attacks that may be expected to cause collateral loss of life among civilians, damage to civilian objects on a scale that is excessive in relation to the military advantage anticipated.
0517. Put more simply, in an attack on a military objective, the collateral damage (loss of life among the civilian population and damage to civilian objects) must not be disproportionate to the military advantage to be gained by the attack on the military objective. The commanding officer must therefore weigh up, when an action is contemplated near civilians or civilian objects, whether it should take place (proportionality).
In addition, the manual states: “An attack should not be carried out if it can be expected to cause collateral damage to cultural property on a scale out of proportion to the expected military advantage.”
In its chapter on non-international armed conflict, the manual states: “In attacks, the basic principle of proportionality must be central. This imposes an obligation to avoid excessive damage with regard to the civilian population and civilian objects.”
In that same chapter, the manual further states: “Military operations in which civilians or civilian objects may be affected must be carried out with due regard for the principle of proportionality.”
In its chapter on peace operations, under the heading “Code of Conduct for the Armed Forces”, the manual states: “Members of the armed forces may be ordered to use force, but must refrain from using it unnecessarily or to excess.”
In this chapter, the manual further states:
The RoE [Rules of Engagement] describe the way in which a peace force may use force (and actions classifiable as provocative) and the means to be used to this end. The RoE are based on the principles of proportionality and subsidiarity in the use of force: use no more force than necessary to achieve the purpose, and ensure that no less invasive alternatives are available.
In addition, the manual provides: “The use of force to protect goods is (also) always conditional on the principles of legality, necessity and proportionality (often called use of minimum force).”
Under the International Crimes Act (2003) of the Netherlands, it is a crime, during an international armed conflict, to commit
the following acts, when they are committed intentionally and in violation of the relevant provisions of Additional Protocol (I) and cause death or serious injury to body or health: … launching an indiscriminate attack affecting the civilian population or civilian objects in the knowledge that such attack will cause excessive loss of life, injury to civilians or damage to civilian objects.
Likewise, “intentionally launching an attack in the knowledge that such an attack will cause incidental loss of life or injury to civilians or damage to civilian objects … which would be clearly excessive in relation to the concrete and direct overall military advantage anticipated” is also a crime, when committed in an international armed conflict.
In its written statement submitted to the ICJ in the Nuclear Weapons case
in 1995, the Netherlands stated: “The general principles of international humanitarian law in armed conflict also apply to the use of nuclear weapons … in particular … the prohibition on attacking military targets if this would cause disproportionate harm to the civilian population”.
In 2003, in reply to written questions by Parliament concerning, inter alia, guidelines for aerial bombardment, the Minister of Defence of the Netherlands stated:
The guidelines for target selection during aerial bombardments are based on the relevant provisions of International Humanitarian Law (IHL). Amongst others, all reasonable precautionary measures must be taken to avoid civilian casualties and to prevent collateral damage to civilians objects. In practice, Dutch fighter pilots will not attack targets, when it is likely that civilians will be present. Also, an attack may not be carried out if the collateral damage to be expected reasonably does not relate to the actual and direct military advantage.