During World War Two hundreds of thousands of children were moved out of London, and other major British cities, to escape the daily bombing, known as the Blitz. This was called evacuation. Many children had a wonderful experience with their new 'families' in the countryside, but sadly others did not.
In the days before telephones and the Internet the only way to keep in touch with loved ones was by writing letters. These letters became a vital link between the children and their families, who otherwise had very little chance to see or contact them.
Due to these factors children will easily to feel abandoned.