French postcard celebrating the role of Red Cross nurses during the First World War, 1915
With the outbreak of World War I, the ICRC found itself confronted with enormous challenges that it could handle only by working closely with the national Red Cross societies. Red Cross nurses from around the world, including the United States and Japan, came to support the medical services of the armed forces of the European countries involved in the war. On October 15, 1914, immediately after the start of the war, the ICRC set up its International Prisoners-of-War (POW) Agency, which had about 1,200 mostly volunteer staff members by the end of 1914. By the end of the war, the Agency had transferred about 20 million letters and messages, 1.9 million parcels, and about 18 million Swiss francs in monetary donations to POWs of all affected countries. Furthermore, due to the intervention of the Agency, about 200,000 prisoners were exchanged between the warring parties, released from captivity and returned to their home country. The organizational card index of the Agency accumulated about 7 million records from 1914 to 1923, each card representing an individual prisoner or missing person. The card index led to the identification of about 2 million POWs and the ability to contact their families. The complete index is on loan today from the ICRC to the International Red Cross and Red Crescent Museum in Geneva. The right to access the index is still strictly restricted to the ICRC.
During the entire war, the ICRC monitored warring parties’ compliance with the Geneva Conventions of the 1907 revision and forwarded complaints about violations to the respective country. When chemical weapons were used in this war for the first time in history, the ICRC vigorously protested against this new type of warfare. Even without having a mandate from the Geneva Conventions, the ICRC tried to ameliorate the suffering of civil populations. In territories that were officially designated as "occupied territories," the ICRC could assist the civilian population on the basis of the Hague Convention's "Laws and Customs of War on Land" of 1907. This convention was also the legal basis for the ICRC's work for prisoners of war. In addition to the work of the International Prisoner-of-War Agency as described above this included inspection visits to POW camps. A total of 524 camps throughout Europe were visited by 41 delegates from the ICRC until the end of the war.
Between 1916 and 1918, the ICRC published a number of postcards with scenes from the POW camps. The pictures showed the prisoners in day-to-day activities such as the distribution of letters from home. The intention of the ICRC was to provide the families of the prisoners with some hope and solace and to alleviate their uncertainties about the fate of their loved ones. After the end of the war, the ICRC organized the return of about 420,000 prisoners to their home countries. In 1920, the task of repatriation was handed over to the newly founded League of Nations, which appointed the Norwegian diplomat and scientist Fridtjof Nansen as its "High Commissioner for Repatriation of the War Prisoners." His legal mandate was later extended to support and care for war refugees and displaced persons when his office became that of the League of Nations "High Commissioner for Refugees." Nansen, who invented the Nansen passport for stateless refugees and was awarded the Nobel Peace Prize in 1922, appointed two delegates from the ICRC as his deputies.