A poster encouraging people to take care during the Blackout
The blackout lasted throughout the war,
plunging Britain into darkness every night. Lights could not be shown outside
at night for any reason at all. Cars drove without headlights, streetlights
were switched off and even torches were banned. It made life not only
inconvenient, but also dangerous. Several people were run over by cars or
bicycles, while others fell down holes or over the edge of bridges that they
could not see.
The reason for the blackout was the fear of
German bomber aircraft. It was known and expected that the bombers would come
by night as well as by day. During daylight British anti-aircraft guns and
fighters could see the German aircraft to try to shoot them down, but at night
the German bombers would be almost impossible to see. They could roam at will
over Britain's skies to rain down death and destruction. And the German bombing
would be much more accurate and deadly if the German airmen could see what they
were aiming at. If the ground was in darkness, aiming would be difficult so the
Germans would be able to do less damage.
It was not only bombaiming that the blackout
was designed to frustrate. Navigating an aircraft in 1939 was usually a
business of following landmarks on the ground: rivers of a particular shape,
road junctions, villages with unusual shapes, large buildings standing alone
among fields. At night very few of these landmarks would be visible, unless
they were lit up. If every house in a village had its lights on, the pilot of
an aircraft high above could make out the shape of the village and would know
where he was. But if the lights were all out, the pilot would have to rely on
less reliable features. Rivers and lakes reflect moonlight, so water features
could be used as navigational aids, but these are few and far between. Even
worse one river bend can look much like another.
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