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Project of an International Declaration concerning the Laws and Customs of War. Brussels, 27 August 1874.
Prisoners of war - Art. 31.
Art. 31. Prisoners of war may be set at liberty on parole if the laws of their country allow it, and, in such cases, they are bound, on their personal honour, scrupulously to fulfill, both towards their own Government and the Government by which they were made prisoners, the engagements they have contracted.
In such cases their own Government ought neither to require of nor accept from them any service incompatible with the parole given.