 On the morning of 7 May 1942, his attack group took off "Zuikaku" in search of the US aircraft carriers.They were unable to find the carriers, however, but did locate the fleet oiler and its escort destroyer instead.After further fruitless searching, Shimazaki's colleague from "Shokaku", Lt Cdr Kakuichi Takahashi, ordered him to take the torpedo bombers home rather than waste their ordnance on small targets.