In the 1970s, a
British television network made a series called
“The World at War,” possibly the most comprehensive television history ever made about
World War II.
But it contains not one word about Bletchley Park, the primary British codebreaking operation of World War II. The reason is very simple: In the 1970s, information about
Bletchley Park was still top-secret, since releasing this information would have risked compromising current espionage efforts. Thus, the existence of
Bletchley Park was still a closely guarded secret in the early 1970s. But, after enough time had gone by, it was no longer necessary to keep these things confidential. Thus, in the decades since
“The World at War,” much of the information about the era’s espionage (including code-breaking) has been officially declassified. Thus, historians today have somewhat more information to work with, in talking about the state secrets of that time. For example, we now know things that were once top-secret, and we now know how some of that information changed hands – while other parts remained protected. This post will try to use some of the now-declassified information, along with more traditional information, to tell the stories of spies and code-crackers in both world wars – especially
World War II. But, in order to achieve a true understanding of the
Second World War, it may help to consider the prior events of the
First World War. The
“Great War,” as it is sometimes called, had some spy stories that are fascinating in their own right – rivaling any others in their human interest. These juicy stories may help to shed some light on the later espionage of the
Second World War – the conflict that most continues to fascinate people today.

Rear of the rebuilt British “Bombe” computer, used at Bletchley Park in World War II England