Because they gave people some warning and therefore time to take shelter
Air raid sirens
I should imagine the air raid wardens by sounding an air raid siren!
air raid sirens would signal there was going to be an air attack when this happened people would cram into air raid shelters
Sirens.
Answer: Air Raid sirens. --------------------------------------------- the enemy is coming to kill us run for y'all lives
Air raid sirens were mounted to telephone poles, buildings and light poles. They were powered by electricity. They did not have solar power then. There are solar powered sirens now. They did have hand cranking sirens then. There were some men who were hit by bullets while they were cranking the sirens. The Nazis wanted to get the siren silenced.
The danger of being subjected to aerial bombardment .
nothing
Air raid sirens signify an emergency situation, such as an imminent attack or a natural disaster, where people need to take immediate shelter and follow safety procedures. They are used to alert the public and ensure a quick response to potential danger.
To let people know that an air raid was coming so they could seek shelter before enemy bombers dropped bombs on them. Without the sirens, the bombs would have been falling before they would have time to get to a shelter.
They were used to warn people of impending attacks of bombers. Today they are used for tonados and other disaters.
When the Air Raid sirens stop and the bombs stop falling it is safe to leave.