The usual pledge given in the parole is not to serve during the existing war, unless exchanged.
This pledge refers only to the active service in the field, against the paroling belligerent or his allies actively engaged in the same war. These cases of breaking the parole are patent acts, and can be visited with the punishment of death; but the pledge does not refer to internal service, such as recruiting or drilling the recruits, fortifying places not besieged, quelling civil commotions, fighting against belligerents unconnected with the paroling belligerents, or to civil or diplomatic service for which the paroled officer may be employed.
131
If the government does not approve of the parole, the paroled officer must return into captivity, and should the enemy refuse to receive him, he is free of his parole.
132
A belligerent government may declare, by a general order, whether it will allow paroling, and on what conditions it will allow it. Such order is communicated to the enemy.
133
No prisoner of war can be forced by the hostile government to parole himself, and no government is obliged to parole prisoners of war, or to parole all captured officers, if it paroles any. As the pledging of the parole is an individual act, so is paroling, on the other hand, an act of choice on the part of the belligerent.
134
The commander of an occupying army may require of the civil officers of the enemy, and of its citizens, any pledge he may consider necessary for the safety or security of his army, and upon their failure to give it he may arrest, confine, or detain them.