Preprinted acknowledgment postcards sent by return by prisoners-of-war in German camps on receipt of relief parcels organised by the Birr Castle scheme. Personal details recorded include name, rank and internment camp.

Administrative correspondence relating to the prisoner of war relief scheme set up at Birr Castle under the patronage of Lady Rosse; postcards and letters of thanks from the prisoners of war from Irish regiments (but predominantly the Irish Guards) interned in Germany; and acknowledgment postcards of parcels received from same.