TLDR - Fleet Problem 13 was a naval wargame in the vicinity of the Hawaiian Islands in the winter of 1932: "The expectation was that Yarnell would attack with

TLDR - Fleet Problem 13 was a naval wargame in the vicinity of the Hawaiian Islands in the winter of 1932: "The expectation was that Yarnell would attack with battleships, but instead he left his battleships behind and proceeded only with his carriers to the north of Hawaii where it was less likely he would be detected. With a storm as cover, at dawn on a Sunday, February 7, Yarnell’s 152 (some sources state 153) planes attacked the harbor from the northeast, just as the Japanese would ten years later. The army airfields were first put out of comission after which battleship row was attacked—with multiple hits on Navy ships. No defending aircraft were able to launch. The Navy’s war-game umpires declared the attack a total success, prompting Yarnell to strenuously warn of the Japanese threat. The Navy exercise became known as Fleet Problem 13 and the results were largely ignored by Navy brass while the Japanese….the revisionists declared... paid close attention."