The Next War

Indications Intelligence in the Early Cold War

Reviewed by Ron Verzuh

Posted February 14, 2026

The Cold War began in earnest in March 1947, about two years after cipher clerk Igor Gouzenko defected from the Soviet (now Russian) Embassy in Ottawa and began naming names. During that time, intelligence officials in the United Kingdom, the United States and Canada hunted for evidence that the Soviets were planning a nuclear attack.

In The Next War, historian Timothy Andrews Sayle provides us with a forensic look at the process of informing the leaders of all three countries of an “imminence of war.” Sayle guides us through top-secret documents that each nation developed to reveal “indicators” of “any impending Soviet attack.”

Sayle guides us through top-secret attack-detecting documents

It all seems creepily like an insider view of Dr. Strangelove’s war room in the 1964 Stanley Kubrick movie of the same name. Each year from the end of the Second World War, specialists mapped out scenarios — called “appreciations” or “assessments” — to help leaders prepare for an assumed “general war.”

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“Indications intelligence” continually grew more sophisticated. When the Soviets detonated their first atomic bomb in 1949, the stakes went up. Then, the Korean War in 1950 led some to assume the Soviets were planning a “regional war.” The Cuban Missile Crisis in October 1962 further fed the desire to find indicators.

Sayle reveals the fissures in the process, with Canada often on the outside looking in as other representatives shared top-secret documents. Thanks to future prime minister Lester B. Pearson and others, the door wasn’t shut tight and Canada was able to play its part in defending democracy against an imagined communist threat.

While this new chapter in Cold War literature may not be the stuff of a John le Carr. spy novel, it will serve as a welcome sourcebook for other historians; it could also help general readers better understand the risk inherent in this current era of strongman leaders.

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Ron Verzuh is a writer and historian.

This article was published in the Spring 2026 issue of Canada's History magazine.

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