Annex to the Convention: Regulations respecting the laws and customs of war on land - Section I : On belligerents - Chapter II : Prisoners of war - Regulations: Art. 4.
Art. 4. Prisoners of war are in the power of the hostile Government, but not of the individuals or corps who capture them.
They must be humanely treated.
All their personal belongings, except arms, horses, and military papers, remain their property.