§ 131. A new and valuable rule, taken from the Brussels Declaration, is that of article 15 of the Hague Regulations making it a duty of every belligerent to grant facilities to Relief Societies to serve as intermediaries for charity to prisoners of war. The condition of the admission of such societies and their agents is that the former are regularly constituted in accordance with the law of their country. Delegates of such societies may be admitted to the places of internment for the distribution of relief, as also to the halting-places of repatriated prisoners, through a personal permit of the military authorities, provided they give an engagement in writing that they will comply with all regulations by the authorities for order and police.
§ 132. Captivity can come to an end through different modes. Apart from release on parole, which has already been mentioned, captivity comes to an end--(1) through simple release without parole; (2) through successful flight; (3) through liberation by the invading enemy to whose army the respective prisoners belong; (4) through exchange for prisoners taken by the enemy; (5) through prisoners[265] being brought into neutral territory by captors who take refuge there; and, lastly (6), through the war coming to an end. Release of prisoners for ransom is no longer practised, except in the case of the crew of a captured merchantman released on a ransom bill.[266] It ought, however, to be observed that the practice of ransoming prisoners might be revived if convenient, provided the ransom is to be paid not to the individual captor but to the belligerent whose forces made the capture.
As regards the end of captivity through the war coming to an end, a distinction must be made according to the different modes of ending war. If the war ends by peace being concluded, captivity comes to an end at once[267] with the conclusion of peace, and, as article 20 of the Hague Regulations expressly enacts, the repatriation of prisoners must be effected as speedily as possible. If, however, the war ends through conquest and annexation of the vanquished State, captivity comes to an end as soon as peace is established. It ought to end with annexation, and it will in most cases do so. But as guerilla war may well go on after conquest and annexation, and thus prevent a condition of peace from being established, although real warfare is over, it is necessary not to confound annexation with peace.[268] The point is of interest regarding such prisoners only as are subjects of neutral States. For other prisoners become through annexation subjects of the State that keeps them in captivity, and such State is, therefore, as far as International Law is concerned, unrestricted in taking any measure it likes with regard to them. It can repatriate them, and it will in most cases do so. But if it thinks that they might endanger its hold over the conquered territory, it might likewise prevent their repatriation for any definite or indefinite period.[269]