Author Craig Shirley announced with some fanfare in The Australian that the United States had “no intelligence of a potential Japanese attack.”

Tell us something we don’t know.
Writing all the way back in 1962, Roberta Wohlstetter made clear that the United States “failed to anticipate [the] Pearl Harbor [attack] not for want of the relevant materials, but because of a plethora of irrelevant issues.”
Fast forward through to 1981, when Gordon Prange wrote that the Pearl Harbor attack resulted from a number of factors, including “a vast store of intelligence badly handled.”
In 1985, Rear Admiral Edwin Layton argued that the Office of Naval Intelligence (in Washington DC) “failed to relay to the fleet commander at Pearl Harbor the vital intelligence that might have averted the disaster.”
In sum, historians have known for decades of US intelligence which pointed to a Japanese attack. Craig Shirley’s “discovery” needs to be seen in this context.
Readers should also be aware that exciting historical discoveries have been taking place. To offer but one example: I happily lay claim to discovery of the personal papers of Japan’s pre-Pearl Harbor ambassador to the US.
Discovery of those papers, alongside years of research in the Japanese archives, resulted in a book published only weeks ago by Harvard University Press.
What does my own research tell us about Pearl Harbor? Most immediately, it explains why the Japanese embassy was late in delivering the last note to the US Government. (This was important, because it ensured that the Pearl Harbor attack took place without warning).
Rather than quote myself at length, I will instead take the liberty of reproducing a conversation I held recently with one of my students at the University of Western Sydney.
Student: “Japan’s ambassador in Washington knew nothing of the Pearl Harbor attack?”
My response: “Correct.”
Student: “Japan’s ambassador in the US guessed that Japanese forces would invade Southeast Asia?”
My response: “Correct.”
Student: “Japan’s ambassador in the US was a retired admiral of the Imperial Japanese Navy?”
My response: “Correct.”
Student: “If a Japanese admiral in Washington did not foresee the Pearl Harbor attack, are people being unfair when they argue that U.S. President Franklin D. Roosevelt (or someone in his administration) should have seen it coming?”
I could not have said it better myself.
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