This was sealed up for 75 years after the Battle of Midway:
Retropolis
Unsealed 75 years after the Battle of Midway: New details of an alarming WWII press leak!: June 5, 2017
Six months after the Japanese attack on Pearl Harbor, the June 7, 1942, edition of the Chicago Sunday Tribune, trumpeted news of a stunning American victory over a Japanese armada at the Battle of Midway.
“Jap Fleet Smashed by U.S.; 2 Carriers Sunk at Midway: 13 to 15 Nippon Ships Hit; Pacific Battle Rages,” the front-page headlines read. And in the center of the page, an intriguing side story: “Navy Had Word of Jap Plan to Strike at Sea.”
It was a fascinating, and detailed, description of much of what American intelligence knew beforehand of the enemy’s fleet and plans. Indeed, it was too detailed.
The report — 14 paragraphs long — suggested a secret U.S. intelligence coup, and it became one of the biggest and potentially damaging news leaks of World War II.
The leak hinted that the United States had cracked a Japanese communications code, sparking fury in the Navy and the administration of President Franklin D. Roosevelt, and starting an “espionage” probe by the FBI. It also led to a sensitive grand jury investigation for which testimony would be sealed for more than seven decades.
Excerpted, for full story go to link below:
Luckily, the Japs never caught on.
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and the bottom of the article.
That tidbit was a tually in Walter Lord’s Incredible Victory, 1970.