The Importance of Mass in the Japanese Navy

In every case where he sought the decisive battle, he withheld force to the extent that victory was never assured. He just dialed it in a principle of war called mass. By 1943, hypo had deciphered a great deal of the Japanese naval code J and 25. But there was a partial lapse in the beginning of 1943 into April, or the Japanese for whatever reason, did not change their code. So by April 1943, we were really, huh?