I read of U.S. bomber pilots in 1940 Philippines reading a TIME magazine article that showed all the blind spots (arcs of fire) on the “new” B-17 bomber. They said that since their copy reached the Philippines, the Japanese sure as Hell had one also.
That’s similar to a news item bragging that the Japs couldn’t sink our subs because they set their depth charges too shallow. The Japanese evidently read the article and reset the depth - and we started losing boats. I understand that’s where the moniker “Silent Service” (STFU) came from.
Loose lips sink ships and all.