Germany began bombing Britain in the summer of 1940.
The first daylight air raid happened on September 8, 1940. Over 400 people were killed, and over 1600 were injured.
To stop planes from seeing the cities at night, people blocked their windows with black curtains to keep light from escaping their homes.
Because lights were kept off or very dim, accidents in the streets became much more common. To help with this, white lines were painted on the streets, people walked facing traffic, and many other things were done.
During September 1940, about 177,000 people lived underground for protection against air raids. Some people used Anderson shelters, which were buried underground and held up to 6 people. Others used Morrison Shelters, which were metal mesh boxes that people could hide in.
After war was declared in 1939, Britain could not import the same amount of food as it had before due to German submarines sinking merchant ships. The government issued ration books as a result. These controlled the amount of an item people could buy.