According to a study by the International Law Association‘s Committee on the Use of Force, international law defines armed conflict as always having at least two minimum characteristics: 1.) the presence of organized armed groups that are 2.) engaged in intense inter-group fighting.[63] The fighting or hostilities of an armed conflict occurs within limited zones, referred to as combat zones, theaters of operation, or similar terms. It is only in such zones that killing enemy combatants or those taking a direct part in hostilities is permissible.[64]
Because armed conflict requires a certain intensity of fighting, the isolated terrorist attack, regardless of how serious the consequences, is not an armed conflict.[65]
63 INTERNATIONAL LAW ASSOCIATION, DRAFT FINAL REPORT, supra note 14.
64 The combat zone is a critical concept to the lawful waging of armed conflict. Today, the right to resort to armed force (jus ad bellum) is triggered by an armed attack or Security Council authorization in response to a threat to the peace, breach of the peace or act of aggression. The lawful response to those provocations must be calibrated to be necessary and proportionate in the circumstances. This means the old claim that a state may attack the opponent‘s forces anywhere they are found is no longer supportable. A parallel principle is found in the jus in bello. Combatants may not kill the enemy wherever they find him, but only when reasonably necessary. This means a combatant may kill another person fighting against him in a combat zone, but someone away from the combat, who may be captured, may not be killed. For a more full discussion of these points and the law supporting them, see Mary Ellen O‘Connell, Combatants and the Combat Zone, 43 U. RICH. L. REV. 845 (2009); Christopher Greenwood, Scope of Application of Humanitarian Law, in THE HANDBOOK OF INTERNATIONAL HUMANITARIAN LAW 45, 61-2 (Dieter Fleck ed., 2d ed. 2008); JUDITH GARDAM, NECESSITY, PROPORTIONALITY AND THE USE OF FORCE BY STATES (2004); see also infra p. ___.
65 A significant armed attack may trigger the right to resort to armed force but an armed attack is not an armed conflict unless it is launched by an organized armed group and is responded to with the use of significant military force by another organized armed group. Thus the 9/11 attacks were found to be significant enough to trigger a right to respond under Article 51 of the UN Charter (see UN Security Council Resolution 1368) but an armed conflict did not follow until the United States and United Kingdom responded with significant military force in Afghanistan. Afghanistan was determined by the U.S. and U.K. to have been responsible for the 9/11 attacks, thus giving rise to the right to use force against it. For a detailed discussion of state practice and International Court of Justice decisions relevant to this law, see Mary Ellen O‘Connell, Preserving the Peace: The Continuing Ban on War Between States, 38 CAL. W. INT‘L L.J. 41 (2007) and Mary Ellen O‘Connell, Lawful Self-Defense to Terrorism, 63 U. PITT. L. REV. 889, 889-904 (2002).
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