history · 11 May 1942 · 82 years ago
Joseph Rochefort's cryptanalytic team in Pearl Harbor, US Territory of Hawaii intercepted a radio message from Nobutake Kondo noting that the occupation force for the upcoming campaign would proceed to Saipan, Mariana Islands to await the launch of the operation. Rochefort determined that this occupation force was likely to sail east rather than south, and Midway Atoll was a likely target.
More history on 11 May
OnThisDay.net