Combined Fleet Operations Order No. 2

7 November 1941
Order to: Combined Fleet

First Preparations for War
Y Day 8 December. [3]

C in C, Combined Fleet
Yamamoto, Isoroku

[3]. This order was issued by C in C, Combined Fleet, after he had 
received verbal notification from Chief, Naval General Staff, that 8 
December had been tentatively selected as "Y" Day.

 

(JAPANESE MONOGRAPH NO. 97)