Photograph of a policeman warning people to take cover after the sirens sounded. The same system was used during raids in World War One. Dated 1939

---

Photograph of a policeman warning people to take cover after the sirens sounded. The same system was used during raids in World War One. Dated 1939

---

Size: 3620px × 5794px
Location:
Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 20th, air, alarm, archival, archive, bicycle, bike, britain, british, century, cover, emergency, england, great, historical, history, ii, people, photograph, photography, police, policeman, protection, protective, raid, service, sign, siren, sirens, system, war, warning, world, wwi, wwii