'Chwi a Wyddoch Fwy na Phobl Ereill' [You Know More Than Other People], 1939 UK poster: Bold red and white lettering on black

'Chwi a Wyddoch Fwy na Phobl Ereill' [You Know More Than Other People] (Welsh-language poster)

Bold red and white lettering on black bars reads 'CHWI a wyddoch fwy na phobl ereill' ('You know more than other people'), over a blue panel of Welsh text warning that a few careless words can give the enemy information and cost lives. The tell is the lives-lost consequence; the Welsh text is a language version of an English careless-talk poster.

Propaganda techniques used in this poster

Fear appeal

Date: 1939
Period: Second World War
Made by: H.M. Stationery Office (government issue); printed by Greycaine Ltd., Watford and London
Region: Western and Central Europe
Country: United Kingdom
Medium: Poster
Issuer type: State
Regime: Churchill Government
Leader: Winston Churchill
Audience: Domestic public
Purpose: Warn or inform
Themes: Security and surveillance, War and the military
Event: World War II
Regime: Churchill wartime government
Leader: Winston Churchill
Source: Identified Openly sourced: the speaker is who they say they are
Source: U.S. National Archives and Records Administration, Record Group 44, World War II Foreign Posters, retrieved October 3, 2026
Rights: Public domain (UK Crown copyright, 50 years from publication, expired before 1996; no URAA restoration)
H.M. Stationery Office, 1939-1945. U.S. National Archives (NAID 44268301).

Text on the object

Original (Welsh) · read from the image, not independently checked

CHWI
A WYDDOCH FWY
NA PHOBL
EREILL

Yr ydych mewn safle o ymddiried.
Peidiwch bradychu'r bechgyn sy'n
brwydro.

Gall ychydig o eiriau diofal
roddi gwybod i'r gelyn am
rywbeth a pheri i ni golli
bywydau.

Yn anad dim byddwch yn ochelgar
yn yr hyn a ddywedwch wrth
ddieithriaid ac ar gyhoedd.

Printed for H.M. Stationery Office by Greycaine Ltd., Watford and London. T 51-5664

English translation (machine translation by Claude, not verified by a fluent reader)

YOU
KNOW MORE
THAN OTHER
PEOPLE

You are in a position of trust.
Do not betray the boys who are
fighting.

A few careless words can
give the enemy information about
something and cause us to lose
lives.

Above all, be cautious
in what you say to
strangers and in public.

Printed for H.M. Stationery Office by Greycaine Ltd., Watford and London. T 51-5664