ICRC databases on international humanitarian law
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1949 Conventions and Additional Protocols, and their Commentaries
Historical Treaties and Documents
The Laws of War on Land. Oxford, 9 September 1880.
Part II : Application of general principles #III. Prisoners of war #A. Rules for captivity - Art. 70.
Art. 70. Prisoners cannot be compelled in any manner to take any part whatever in the operations of war, nor compelled to give information about their country or their army.