An alternative explanation is provided by Jean Edward Smith in his biography of Eisenhower: "During World War Two, Burke mistakenly led his destroyer squadron into a Japanese minefield. Admiral Halsey radioed to ask what he was doing in a Japanese minefield. ‘Thirty-one knots,’ replied Burke”. In March 1944, Burke was promoted to Chief of Staff to the Commander of Task Force 58, the Fifth Fleet's Fast Carrier Task Force, which was commanded by Admiral Marc Mitscher. The transfer stemmed from a directive from the Chief of Naval Operations, Admiral Ernest King, that required a surface commander such as Admiral Raymond A. Spruance to have an aviator as Chief of Staff, and an air commander, such as Mitscher, to have a surface officer as Chief of Staff. Neither Mitscher nor Burke were happy with the arrangement, but as time passed Burke realized he had been given one of the most important assignments in the Navy, and his hard work and diligence eventually caused Mitscher to warm to him.