Why were children evacuated from large cities in world war 2?

Children were evacuated because the government did not want themkilled in bombings and other attacks, or left uncared-for if theirparents were killed. In Britain, 2600 children were sent overseas to places such asCanada, New Zealand, Australia, and South Africa. Many more, asmany as 800,000 children, were sent to live in the countryside, away from the likely areas of attacks or invasions, for varyingperiods of time.