The rest of the detached 41st Infantry Regiment re-formed as the Yazawa Detachment, and was initially deployed in Cagayan on north coast of Luzon. It was transferred, landing in Davao City on 28 June 1942, and used to reinforce Nankai Shitai (South Seas Detachment) under command of Major-General Tomitaro Horii. On 18 July 1942, the detachment was reinforced by a company of tanks plus a company of close-support artillery, and ordered to join the thrust to Port Moresby on 31 July 1942. Initially sailing to Rabaul, which was being used as staging point on 16 August 1942, the Yazawa detachment departed on 19 August 1942 on board "Kiyokawa Maru" and "Myoko Maru" . They landed at Gona, around the Japanese beachhead, on 21 August 1942. During the battle of Isurava the Yazawa detachment was held in reserve.