During the war, the air raid siren would sound to warn the citizens of an impending attack.
Во время войны сирена воздушной тревоги звучала, чтобы предупредить граждан о надвигающейся атаке.
Definitions
An air raid siren is a loud warning device used to alert the public of an impending air attack or other emergencies, typically producing a distinctive wailing sound to signal people to take cover or evacuate.