The Americans knew where Yamamoto would be because they had broken the Japanese code. Quite risky in that the Japanese could have put 2 and 2 together, and realized that their code was compromised.
The Americans knew where Yamamoto would be because they had broken the Japanese code. Quite risky in that the Japanese could have put 2 and 2 together, and realized that their code was compromised.
Germany did advise the Japanese that their code had been broken but the Japanese ignored this as they believed that their code was unbreakable.