While Taliban fighters had an initial claim to protection under the conventions, they lost POW status by failing to obey the standards of conduct for legal combatants: wearing uniforms, a responsible command structure, and obeying the laws of war.

I do not think that torture is necessary. But it may be the case that interrogation methods that go beyond questioning, but do not arise to the level of torture, may be necessary to get actionable intelligence from high-ranking al Qaeda leaders.

American soldiers had to guard prisoners on the inside while receiving mortar and weapons fire from the outside. Guantanamo is distant from any battlefield, making it far more secure.

Human rights advocates, for example, claim that the mistreatment of Iraqi prisoners is of a piece with President Bush's 2002 decision to deny al Qaeda and Taliban fighters the legal status of POWs under the Geneva Conventions.

Congress has created and funded a huge peacetime military that has substantial abilities to wage offensive operations, and it has not placed restrictions on the use of that military or the funds to support it, because it would rather let the president take the political risks in deciding on war. If Congress wanted to play a role in restricting war, it could - it simply does not want to. But we should not mistake a failure of political will for a violation of the Constitution.

It is also worth asking whether the strict limitations of Geneva make sense in a war against terrorists.

We can guess that the unacceptable conduct of the soldiers at Abu Ghraib resulted in part from the dangerous state of affairs on the ground in a theater of war.