TheCodeBreakers
Order Number 1, the plan for the Pearl Harbor attack. Two days later, he
set December 8 (Tokyo time) as Y-day and named Vice Admiral Chuichi
Nagumo as Commander, First Air Fleet—the Pearl Harbor strike force. In
the days that followed, the 32 ships that were to compose the force
slipped, one by one, out to sea and vanished. Far from any observation,
they headed north to rendezvous in a bay of barren Etoforu Island, one of
the chill, desolate Kuriles north of the four main islands of Japan.
Behind them the ships left their regular wireless operators to carry on an
apparently routine radio traffic in their own "fists," or sending touch,
which is as distinctive as handwriting.
As the force was gathering, the Foreign Office, which knew only that
the situation was tense and was never told in advance of the time, place,
or nature of the planned attack, prepared on open-code arrangement as
an emergency means of notification
annaabi.ee 
