Lieutenant General Hitoshi Imamura, the commander of the Japanese Eighth Area Army at Rabaul, correctly deduced his opponent's intentions and the strength of Kanga Force and resolved to head off the danger to Lae. He ordered Lieutenant General Hatazō Adachi's Eighteenth Army to secure "important areas to the west of Lae and Salamaua". On 29 December 1942, Adachi ordered the 102nd Infantry Regiment and other units under the command of Major General Toru Okabe, the commander of the infantry group of the 51st Division, to move from Rabaul to Lae and then immediately advance inland to capture Wau. Okabe's force was known as the Okabe Detachment.