Light cruiser Yura, training cruiser Kashii, the escort ship Shumushu, the gunboat Eiko Maru, the minelayer Hatsutaka and 9 transports set sail from Indo China on the morning of March 1st.
With Summerville's fleet exercising mid-Indian Ocean only two armed trawlers, HMS Fandango and HMS Foxtrot, patrolled the Karimata Straits. The Japanese slipped easily past them and arrived in Phuket just before sun-up on the 6th. Here they met up with the light cruiser Sendai, and the destroyers Isonami, Uranami, Ayanami, A afire, Asagirl, Yugiri and Shirakumo.
Admiral Nagumo had his flag on the cruiser Chokai. Along with Carrier Division 4, the aircraft carriers Hiyō Junyō, Ryūjō, and Tosa; Cruiser division 7 , the heavy cruisers Kumano, Suzuya, Mikuma, Mogami and the destroyers Fubuki, Hatsuyuki, Shirayuki, Suzuva and Murakami from the destroyer division 11 steamed 40 nautical miles west of the Hinako Islands.