These rules and others not mentioned in detail were not always properly observed by some of the belligerent powers in the Great War. An improved code of rules was drafted by the International Law Association and adopted at their 1921 Conference held at The Hague. It is understood that these rules have met with the approval of the authorities in the United Kingdom and elsewhere.
A new departure was made in 1907 by clauses providing for the institution of a bureau for information relative to prisoners of war. This institution was of great value during the World War. It is the duty of the bureau to receive and collect all objects of personal use, valuables, letters, etc., found on the battlefields or left by prisoners who have died in hospital or ambulance, and to transmit them to those interested. Letters, money orders and valuables, as well as postal parcels destined for the prisoners of war or despatched by them, are to be free of all postal duties both in the countries of origin and destination, as well as in those they pass through. Gifts and relief in kind for prisoners of war are to be admitted free of all duties of entry, as well as of payments for carriage by the government railways.
The obligations of belligerents with regard to sick and wounded in war on land are governed by the Geneva Convention of July 6, 1906. By this Convention ambulances and military hospitals, their medical and administrative staff and chaplains are "respected and protected under all circumstances," and the use of a uniform flag and arm-badge bearing a red cross are required as a dis tinguishing mark of their character. A Convention, accepted at the Peace Conference of 1899, governs the treatment of hospital ships, making them inviolable as well as the religious, medical or hospital staff of any captured ship.
To kill or wound treacherously individuals belonging to the hostile nation or army.
To kill or wound an enemy who, having laid down arms or hav ing no longer means of defence, has surrendered at discretion.
To declare that no quarter will be given.
To employ arms, projectiles or material of a nature to cause superfluous injury.