major Japanese naval units in the Indian Ocean virtually ceased. Criticism of Nagumo Nagumo's leadership has been characterized by Andrew Boyd as rigid and unimaginative, and contributed to the escape of the British Eastern Fleet. The manoeuvring of his fleet was mainly to facilitate strikes on Colombo and Trincomalee; the possibility that the enemy might be at sea was apparently not seriously considered. He failed to appreciate that the direction that Dorsetshire's force was sailing, and the later appearance of British carrier-based aircraft, were related. Furthermore, due to limited aerial reconnaissance, Nagumo had little concrete information of what was around him, especially to his front and exposed flanks. He was not served by the confidence that there was nothing else to be found outside of the few searches made. The limited air searches conducted at the start of the battle reflected contemporary IJN practice, where the intensity of air searches was scaled according to expected threats. The stronger morning search on 6 April reflected the suspicion that British carriers might be present. The intensity of later air searches dropped off when the British carriers were not found and there was little expectation of encountering them. Ultimately, all navies suffered from inadequate air search planning during this period. Problems with Japanese carrier operations The raid also provided early examples of problems with Japanese carrier operations. Inadequate aerial reconnaissance failing to locate the enemy fleet in a timely fashion, the difficulty of rearming aircraft for a different mission at short notice, and the penetration of the CAP by enemy aircraft due to the lack of radar-directed fighter control, would all recur at the Battle of Midway. Criticism of Somerville Somerville's leadership was characterized by a willingness to take risks, bordering on recklessness. The initial deployment of the fleet on 30 March endangered the British fleet in multiple ways. Somerville was relying on radar – manned by inexperienced personnel – to locate the enemy and facilitate night strikes. If the Japanese approached as expected from the southeast and the British failed to find the Japanese before dawn, the distance between the two fleets would be no more than ; the British would be detected by Japanese aerial reconnaissance at dawn and be subject to air attack for the entire day. Much the same could have been expected had Somerville still been on station when the Japanese arrived – as they did – from