Belligerent reprisals have long occupied a curious position in the law of armed conflict. They are one of the oldest means for the enforcement of that law, and, until recently, were widely regarded as indispensable. Yet the scope for abuse and the danger that reprisals, far from enforcing the law, can produce an escalating spiral of atrocities completely undermining respect for the law have also long been recognized. Thus, the Lieber Code of 1863 states that:
‘The law of war can no more wholly dispense with retaliation than can the law of nations, of which it is a branch. Yet civilised nations acknowledge retaliation as the sternest feature of war. A reckless enemy often leaves to his opponent no other means of securing himself against the repetition of barbarous outrage’.