Both sides expected to find each other early the next day, and spent the night preparing their strike aircraft for the anticipated battle as their exhausted aircrews attempted to get a few hours' sleep. In 1972, U.S. Vice Admiral H. S. Duckworth, after reading Japanese records of the battle, commented, "Without a doubt, May 7, 1942, vicinity of Coral Sea, was the most confused battle area in world history." Hara later told Yamamoto's chief of staff, Admiral Matome Ugaki, he was so frustrated with the "poor luck" the Japanese experienced on 7 May that he felt like quitting the navy.