Air raid sirens first sounded the warning in London in September 1939.
They became an almost daily part of life in the capital a year later during the height of the Blitz.
When people heard the siren they would stop what they were doing and make for a shelter.
These might be Anderson shelters constructed from corrugated iron which were built in gardens, or Morrison shelters which were constructed indoors.
In London many people crowded into tube stations and spent the raid underground.
Often daily life would continue within the larger shelters - for example, children continuing their lessons inside their school shelter.
A collection of programmes to download as mp3 files at any time. Includes dance and music.
See all School Radio and other Learning podcasts available from the BBC Podcast Directory.
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Join Jarvis Cocker on Radio 4 to remember the long-running School Radio series 'Singing Together'.
Commemorate 100 years since WW1 by staging our specially-written play 'Archie Dobson's War'.
All 13 episodes of Michael Morpurgo's moving WW1 story are available to listen to online.
Notes to support the programmes including details of all the series content.