In an age of terrorism, guerilla and total warfare the medieval doctrine of Just War needs to be re-defined. Moreover, issues of legitimacy, efficacy and morality should not be confused. Legitimacy is conferred by institutions. Not all morally justified wars are, therefore, automatically legitimate. Frequently the efficient execution of a battle plan involves immoral or even illegal acts.As international law evolves beyond the ancient percepts of sovereignty, it should incorporate new thinking about pre-emptive strikes, human rights violations as casus belli and the role and standing of international organizations, insurgents and liberation movements.Yet, inevitably, what constitutes "justice" depends heavily on...