Exercise Tocsin was an emergency preparedness drill held by the

Government of Canada The government of Canada (french: gouvernement du Canada) is the body responsible for the federal administration of Canada. A constitutional monarchy, the Crown is the corporation sole, assuming distinct roles: the executive, as the ''Crown ...

on November 13, 1961The Exercise Tocsin radio broadcast
/ref> that simulated a nuclear attack by the

USSR The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen nationa ...

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

. Every law enforcement agency, provincial, and municipal government took part in the exercise. Part of the exercise was a 13-minute

radio program A radio program, radio programme, or radio show is a segment of content intended for broadcast on radio. It may be a one-time production or part of a periodically recurring series. A single program in a series is called an episode. Radio networ ...

that was broadcast by every radio transmitter in the country. The broadcast told citizens of Canada what to do in the event of nuclear war.

References

Cold War: Tocsin B - This is not an emergency
Military history of Canada {{Canada-mil-hist-stub