at 11:00, bound for Penang in Japanese-occupied British Malaya. During the detachment's voyage, 16 United States Army Air Forces B-25 Mitchell bombers launched by the aircraft carrier struck targets on Honshu in the Doolittle Raid on 18 April 1942. The detachment received orders from the 6th Fleet that day to divert from its voyage and head northeast, passing north of the Bonin Islands, to intercept the U.S. Navy task force that had launched the strike. The detachment failed to find the U.S. ships and soon resumed its voyage. I-30 and Aikoku Maru called at Penang from 20 April to 22 April 1942 before heading into the Indian Ocean to conduct an advance reconnaissance of the "A" Detachment's planned operating area. The rest of the "A" Detachment reached Penang on 27 April 1942, where the seaplane carrier — which had undergone modifications allowing her to carry Type A midget submarines — rendezvoused with it. I-16, I-18, and I-20 each embarked a midget submarine at Penang. Indian Ocean operation I-18 and the other "A" detachment units got underway from Penang on 30 April 1942, headed westward into the Indian Ocean with I-10 serving as the detachment's flagship. The submarines refueled at sea from Aikoku Maru and Hōkoku Maru on 5, 10, and 15 May 1942. I-18 suffered a mishap on 17 May when her port diesel engine flooded in heavy seas and four of its cylinders seized, damage which prevented her from reaching the launch area for the midget submarines on schedule. I-10′s Yokosuka E14Y1 (Allied reporting name "Glen") floatplane began reconnaissance flights over ports in South Africa by reconnoitering Durban on 20 May 1942, followed by flights over East London, Port Elizabeth, and Simon's Town over the next week. On the night of 29 May, the plane flew over Diego-Suarez, Madagascar, sighting the battleship among the ships anchored there. The "A" detachment commander selected Diego-Suarez as the target for a midget submarine attack, scheduled for 30 May 1942. I-16 and I-20 launched their midget submarines off Diego-Suarez on 30 May, but I-18′s midget suffered engine failure and she could not launch it. After the midget submarine attack, the "A" detachment began anti-shipping operations. I-18 sank the Norwegian 2,158-gross register ton merchant ship Wilford in the Mozambique Channel at on 8 June 1942, then jettisoned her midget submarine on 9 June. On 1 July 1942, she heavily damaged the Dutch 1,805-ton merchant