A U.S. Huey Cobra firing rockets at an enemy target in Ia Drang, Vietnam, October 1965.

Intervention is as ancient and well-established an instrument of foreign policy as are diplomatic pressure, negotiations and war. From the time of the ancient Greeks to this day, some states have found it advantageous to intervene in the affairs of other states on behalf of their own interests and against the latters' will. Other states, in view of their interests, have opposed such interventions and have intervened on behalf of theirs.

It is only since the French Revolution of 1789 and the rise of the nation- state that the legitimacy of intervention has been questioned. Article 119 of the French Constitution of 1793 declared that the French people "do not interfere in the domestic affairs of other nations and will not tolerate interference by other nations in their affairs." This declaration ushered in a period of interventions by all concerned on the largest possible scale. For a century and a half afterwards, statesmen,

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