From the Washington Post:
Col. David Hogg, commander of the 2nd Brigade of the 4th Infantry Division, said tougher methods are being used to gather the intelligence. On Wednesday night, he said, his troops picked up the wife and daughter of an Iraqi lieutenant general. They left a note: “If you want your family released, turn yourself in.” Such tactics are justified, he said, because, “It’s an intelligence operation with detainees, and these people have info.” They would have been released in due course, he added later.
The tactic worked. On Friday, Hogg said, the lieutenant general appeared at the front gate of the U.S. base and surrendered.
From the Geneva Convention
Art. 3. In the case of armed conflict not of an international character occurring in the territory of one of the High Contracting Parties, each Party to the conflict shall be bound to apply, as a minimum, the following provisions:
(1) Persons taking no active part in the hostilities, including members of armed forces who have laid down their arms and those placed hors de combat by sickness, wounds, detention, or any other cause, shall in all circumstances be treated humanely, without any adverse distinction founded on race, colour, religion or faith, sex, birth or wealth, or any other similar criteria.
To this end the following acts are and shall remain prohibited at any time and in any place whatsoever with respect to the above-mentioned persons:
(a) violence to life and person, in particular murder of all kinds, mutilation, cruel treatment and torture;
(b) taking of hostages;
……………………………
Art. 34. The taking of hostages is prohibited.
What positively amazes me is this little tidbit of information was buried halfway down the article with absolutely no challenge from the reporter.