During the First World War the ICRC set up an international agency for centralizing information about prisoners of war and enabling families to send them relief parcels. Among other things, the agency collected and passed on correspondence between prisoners of war and families anxious for news of their loved ones.
For the first time, ICRC delegates visited prisoner-of-war camps in Europe and the rest of the world. In 1917 the ICRC was awarded the Nobel Peace Prize for its activities. On 6 February 1918 the ICRC appealed to the belligerents not to use poison gas.