Every prisoner of war, when questioned on the subject, is bound to give only his surname, first names and rank, date of birth, and army, regimental, personal or serial number, or failing this, equivalent information.
[…]
No physical or mental torture, nor any other form of coercion, may be inflicted on prisoners of war to secure from them information of any kind whatever. Prisoners of war who refuse to answer may not be threatened, insulted, or exposed to any unpleasant or disadvantageous treatment of any kind.
I doubt he gave away this information willingly.
Article 14:
Prisoners of war are entitled in all circumstances to respect for their persons and their honour.
Coercing POWs to give away positions of their troops seems to be humiliating to me.