Sirens.
Air raid sirens
Usually screaming or chaos warmed people that a raid was about to begin. Occasionally gun shots would signal a raid.
by a warden setting of the air-raid siren
I should imagine the air raid wardens by sounding an air raid siren!
They put up air raid shelters; warned people with posters; the arp was set up also to contribute to the war effort.
wondering the same question... Nancy ward
Raid means to enter a place by force to attack or steal something
it took place in london
Commodore Level - "Raid a powder house and blow it up"Be warned - it's a very low drop frequency!
Air raids are where planes fly over cities or towns and bomb them. There is no raid as such, but the place is bombed. This is why there are places called air raid shelters, either steadily built above ground or dug in below ground where people could hide from the bombing.
Before an air raid began two warnings were sounded - amber (yellow), then red alert. When it was safe to leave air raid shelters and walk about an 'all clear' signal was sounded.They were alerted by the sound of the sirens, which are used nowadays as signals to tell factory-workers that their shift is finished.
John Browns Raid took place in Harpers Ferry, West Virginia.