The allied shooting down of Japan's commander in chief, Isoroku Yamamoto, was based on breaking the Japanese naval codes and attests to your point of view.
From his wikipedia article: He died during an inspection tour of forward positions in the Solomon Islands when his aircraft (a Mitsubishi G4M "Betty" bomber) was shot down during an ambush by American P-38 Lightning fighter planes. His death was a major blow to Japanese military morale during World War II.
From his wikipedia article: He died during an inspection tour of forward positions in the Solomon Islands when his aircraft (a Mitsubishi G4M "Betty" bomber) was shot down during an ambush by American P-38 Lightning fighter planes. His death was a major blow to Japanese military morale during World War II.
http://en.wikipedia.org/wiki/Isoroku_Yamamoto